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How to make a paper hidden blade wikihow

how to make a paper hidden blade wikihow

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Three Methods:Building the CasingAttaching the BladeStrapping it OnCommunity Q&A

It's an unpredictable world out there, and you never know when you might need a blade for protection. The best place to hide one is along your forearm, where it's at the ready when a tricky situation gets out of hand. Read on to learn how to make a hidden blade that straps to your arm and flicks out with a twitch of your finger.


Method 1 Building the Casing

  1. Image titled Make a Hidden Blade Step 1


    Gather your parts and tools. This hidden blade is the real deal, and you're probably going to need to take a trip to the hardware store to get all the right parts and tools. You can get all of these parts for between 35 and 40 dollars depending on where you live. Here's what you'll need to make your own hidden blade:



    /0/00/Make a Hidden Blade Step 1 Version 2.360p.mp4

    • Hidden blade parts:
      • A 14-inch standard drawer slide. Get a flat drawer slide meant to be fitted to the middle of a drawer. This will become the case for the hidden blade.[1]
      • 2 extension springs, 1⁄4 inch (0.6 cm) by 1 1⁄2 inch (3.8 cm), 8.46 pound work weight. The springs should look thick and fat.[2]
      • A pack of flathead Phillips screws size #8-32 thread, 2 inches (5.1 cm) long, with nuts.
      • A key ring that will slip easily over your finger.
      • Some fishing line. Get clear line so you won't be able to see it against your hand.
      • A 14-inch piece of aluminum metal sheeting.
      • A 14-inch piece of cardboard.
      • Industrial strength velcro.
      • An old belt or piece of leather.
    • Tools you'll need:
      • A pair of pliers.
      • A dremel.
      • A drill.
      • Scissors.
      • A metal file.
      • Some WD-40.
  2. Image titled Make a Hidden Blade Step 2


    Take the drawer slide apart. The drawer slide will consist of three separate tiers. Start by pushing the black latch under the top tier and removing the top tier from the slide, then bend the metal tab located at the end of the large bottom tier and slide out the middle tier, the one with the ball bearing track inside it. [3]



    /d/d7/Make a Hidden Blade Step 2 Version 2.360p.mp4

    • You can put the top and bottom tiers away, since you won't need them for the rest of the project.
    • You'll also have extra ball bearings. Save these in case you lose parts as you go along; you might need replacements.
  3. Image titled Make a Hidden Blade Step 3


    Remove the ball bearing track from the middle tier. Do this by popping off the tab or cap at the end of the tier, making sure to save it. Slide out the ball bearing track and make sure to keep all of the ball bearings.



    /d/d5/Make a Hidden Blade Step 3 Version 2.360p.mp4

  4. Image titled Make a Hidden Blade Step 4


    Cut the tier to the length of your forearm. Hold your arm in front of you with your elbow bent and your palm facing up. Lay the tier against your forearm, with the end of the tier resting at your wrist. Decide how much length you'll need to take off to have the tier rest comfortably against your arm; it should end a few inches from your elbow crease. Use the dremel to cut the appropriate length from the end of the tier that does not have a cap.



    /a/a9/Make a Hidden Blade Step 4 Version 2.360p.mp4

    • Do not cut off the end of the tier where you popped off the tab or cap to take out the ball bearing track. You'll need to be able to replace that piece later.
    • Use the metal file to file down any sharp edges after you make the cut.
    • Take safety precautions when you're cutting the metal. Wear safety goggles and work in an appropriate workspace.
  5. Image titled Make a Hidden Blade Step 5


    Pinch the tier's edges. Use the pliers to bend in the two end edges of the tier on the side that does not have a cap. This will prevent the ball bearing track from falling out when you slide it back in.



    /4/43/Make a Hidden Blade Step 5 Version 2.360p.mp4

  6. Image titled Make a Hidden Blade Step 6


    Cut out the center of the tier. Cut out a rectangular piece of metal from the center of the tier with the dremel. Make sure you don't cut out the area where the cap will be reattached at one end of the tier, and leave an inch of metal at the pinched end of the tier as well. Discard the rectangular piece you cut out, and file the sharp edges on the tier.



    /a/ab/Make a Hidden Blade Step 6 Version 2.360p.mp4

  7. Image titled Make a Hidden Blade Step 7


    Cut the ball bearing track. It should have five openings, and you'll need to cut it so that it you've got a row of just three. Use the dremel to make a straight cut to shorten the ball bearing track.



    /e/e5/Make a Hidden Blade Step 7 Version 2.360p.mp4

    • The shortened track should hold 6 ball bearings on each side.
    • If your tier is on the longer side and you can fit a longer track inside it, you can cut the ball bearing track down to four openings instead. Don't cut it shorter than 3, though, since it needs to have at least 3 openings to work properly.
  8. Image titled Make a Hidden Blade Step 8


    Drill holes in the ball bearing track. Use the drill to create two holes in the track between the openings. Ensure the holes are big enough for the screws to fit.



    /9/9d/Make a Hidden Blade Step 8 Version 2.360p.mp4

  9. Image titled Make a Hidden Blade Step 9


    Drill a hole in the tier tab. Take the plastic tab you removed from the middle tier. Drill a hole the same size as the holes on the ball bearing track. You'll need to be able to fasten it to the track when it's time to put the contraption together.



    /4/46/Make a Hidden Blade Step 9 Version 2.360p.mp4

Method 2 Attaching the Blade

  1. Image titled Make a Hidden Blade Step 10


    Create a tester blade. Cut a length of cardboard so that it's the size and shape of a blade that will fit within the ball bearing track. The end of the "blade" should align with the end of the track. Make two holes in the cardboard that align with the holes you drilled in the ball bearing track.



    /e/ee/Make a Hidden Blade Step 10 Version 2.360p.mp4

  2. Image titled Make a Hidden Blade Step 11


    Cut the metal blade. Trace the cardboard blade cutout onto a piece of sheet metal, including the two holes in the middle. Cut the blade shape from the metal and drill two holes in the middle.



    /a/af/Make a Hidden Blade Step 11 Version 2.360p.mp4

  3. Image titled Make a Hidden Blade Step 12


    Cut down the screws. The screws will be too long, so you'll need to cut them down by about half using the dremel.



    /4/46/Make a Hidden Blade Step 12 Version 2.360p.mp4

  4. Image titled Make a Hidden Blade Step 13


    Fasten the blade to the ball bearing track. Place the ball bearing track upside down on your table, so that the ridge parts are facing down and the flat side is up. Lay the blade on top of the ball bearing track so that the screw holes are aligned. Thread screws through the holes and keep them in place with the nuts.



    /c/ce/Make a Hidden Blade Step 13 Version 2.360p.mp4

  5. Image titled Make a Hidden Blade Step 14


    Put the ball bearing track back into the middle tier. Insert it so that the blade is pointing toward the pinched end of the tier. The ball bearing track should slide in easily; make sure all the ball bearings are in their correct place.



    /d/d9/Make a Hidden Blade Step 14 Version 2.360p.mp4

  6. Image titled Make a Hidden Blade Step 15


    Add a spring and replace the black cap. Place the spring over the second screw on the blade. Now replace the black cap and screw it on tight, holding it in place with a nut. This will hold the whole contraption together.



    /2/2b/Make a Hidden Blade Step 15 Version 2.360p.mp4

  7. Image titled Make a Hidden Blade Step 16


    Attach fishing line. Lay the tier against your forearm and cut a length of fishing line that extends from the second screw on the blade to your middle finger. Make sure it's long enough to wrap around your finger while your hand is in a fist, and add a little extra to make sure you can tie it around a key ring. Tie one end of the line over the second screw, making sure to slip it over the nut so it will stay in place, and tie the other end around a key ring.



    /c/c2/Make a Hidden Blade Step 16 Version 2.360p.mp4

    • Make sure the fishing line is cut to the right length. It shouldn't be too taut, but if it's too loose it won't work. When the ring is around your middle finger and your fist is closed, the line should be snug. When you open your hand, it should pull the blade out.
    • Move the line back and forth to test whether the blade moves easily along the track.

Method 3 Strapping it On

  1. Image titled Make a Hidden Blade Step 17


    Attach velcro strips to the underside of the tier. Cut two one-inch pieces of velcro. Attach one piece to the underside of the front of the track, and another piece to the underside of the other end of the track. Make sure you don't attach the velcro to the plastic tab piece.



    /e/eb/Make a Hidden Blade Step 17 Version 2.360p.mp4

  2. Image titled Make a Hidden Blade Step 18


    Make belt straps. Cut the belt into two strips: one to wrap around your forearm, the other to wrap around your wrist. Attach velcro pieces to the insides of the straps so that they fasten snugly around your forearm and wrist.



    /1/10/Make a Hidden Blade Step 18 Version 2.360p.mp4

  3. Image titled Make a Hidden Blade Step 19


    Attach the straps to the hidden blade. Remove the adhesive backing from the velcro pieces on the tier and attach the tier to the two belt straps. Remember to position it so that the blade point should be directed toward your hand, away from your body.



    /0/09/Make a Hidden Blade Step 19 Version 2.360p.mp4

  4. Image titled Make a Hidden Blade Step 20


    Put the blade on. Strap the blade to the underside of your forearm by attaching the belt at your upper forearm and wrist. Arrange the keyring around your middle finger and make a fist with your hand.



    /f/f6/Make a Hidden Blade Step 20 Version 2.360p.mp4

    • Hide the blade under a loose long-sleeved shirt.
    • Make sure it's positioned so that it won't cut your hand or clothes.
  5. Image titled Make a Hidden Blade Step 21


    Discharge the blade. Point your arm away from your body and open your hand. The keyring will pull the fishing line, which will trip the blade and send it springing forward. When you let go of the keyring, the blade will retract.



    /1/1d/Make a Hidden Blade Step 21 Version 2.360p.mp4

Community Q&A

Add New Question
  • If I get a concealed carry weapon license, is it still illegal to carry a hidden blade?

    wikiHow Contributor

    Yes. Having a concealed carry license does not get you past the state laws concerning knives. Most states have laws concerning the length of blade you are allowed to carry concealed. Most large fixed blade knives and swords must be carried openly.

  • Can you clarify step six a little bit more?

    wikiHow Contributor

    In step 6, connect the spring to back of the biggest tier. If your tier has a plastic cap, add it and drill a hole before connecting the spring.

  • How do I hide the blade after I discharge it?

    wikiHow Contributor

    The blade isn't made to be hidden after discharging. It's only made to be hidden when you're not utilizing it.

  • Can a fake rubber knife be substituted for this?

    wikiHow Contributor

    Yes, if you're just going to have it for fun and not use it for real.

  • Will the government ever make these legal to conceal carry?

    wikiHow Contributor

    Most likely not, but you won't have to use this in any situation in which your attacker isn't also breaking the law.

Ask a Question

If this question (or a similar one) is answered twice in this section, please click here to let us know.



  • You can use a piece of cardboard in place of the blade for a safer version.
  • Depending on the laws where you live, having a fake weapon that looks like the real thing can still cost you big time. If you are going to carry a blade, have a good reason prepared before you take your "fake" knife into any public area.


  • This blade is sharp enough to cause some damage, so discharge it with caution.
  • This blade is considered a concealed weapon in the United States and is therefore illegal. Any person who chooses to construct one should be cautious about when and where it is carried.

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  1. Cokivilum

    The ravens bring news of hidden rituals to summon hellish creatures! Take up and join the

  2. Zehowahox

    The ravens bring news of hidden rituals to summon hellish creatures! and join the fight!

  3. Vowibomimop

    The ravens bring news of hidden rituals to summon hellish creatures! Take up and join the fight!

  4. Movapob

    The arm blade I use isn"t the only hidden blade on my body. [paps bulge]

  5. Xocucaputepi

    The ravens bring news of hidden rituals to summon hellish creatures! Take up and join the fight!

  6. Gacozulelit

    By sticking it onto the blade, the poison was hidden

  7. Wojemitopa

    When the two masked man weren"t watching he had cutted the rope from the chair with his hidden blade and used a smoke grenade and killed-

  8. Weheqoza

    Lie with me now under lemon tree skies. Show me the shy, slow smile you keep hidden by warm brown eyes.

  9. Podaridevij

    Oooh!! Challenge accepted! Can"t wait to watch it! : )

  10. Kipilibosu

    The ravens bring news of hidden rituals to summon creatures!Take up and join the fight!

  11. Rezogawelah

    Wish this deal would come back! Would snap that hidden blade up in a heartbeat!!

  12. Jegamos

    --two handguns, a hidden blade on his right arm, a regular gun, a knife, a katana and a few grenades.

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