I am not responsible for anything you may do or any injury caused in the making of this knife. I must say that this idea should not be credited to me because I saw someone on Youtube do it first. These are illegal, which means don't carry them in public!
I am sorry that this took so long for an Instructable as I am working on a musket (see other Instructable)
Step 1: Materials
You will need:
-Angle Grinder with cutting wheel
-Metal, preferably an old circular saw blade
-Various sand paper and files
-2 Screws or bolts
-Cup of water
Step 2: Designing the Blade
With the blade, you must measure and think, is this enough room to fit the handles? You can design any type of blade you want, cut it out on a piece of paper and trace it on to your metal. Then cut it out with your angle grinder. Grind away all the burs. Dunk it in water. The grinder does not get the blade really hot to where it loses its edge holding temper.
Step 3: Drill Your Holes in the Blade
Just try and drill your holes the best you can with an idea of the gap you will have if you go to far away. Drill the holes in the blade about one-eighth of an inch inwards of the side. DRILL IT!
Step 4: Preparing the Sharpies
Now you want to get 2 sharpies like the one below. Start by getting some pliers and removing the tip and pull out the black part where its at. Remove the foam ink tube and dispose. Glue the part you just pulled out back in and glue the cap on to that.
Step 5: File and Sand Your Blade
You can sand your blade to your own degree. Make it sharp, dull or whatever you want.
Step 6: Cutting the Sharpies
With your angle grinder or dremel, cut a straight line right down the side, dont go fast or you will melt it. File with needle files.
Drill a hole directly in the end of your sharpie, the blunt end,not the cap. Connect the blade to your sharpies with bolts, you should understand it its pretty easy. Thanks! Comment, Rate, for more instructables like this!