Step 1: Supplies
A Toysmith illusion bank (I got mine at a Michaels Arts and Crafts Store)
A glue stick
A small philips-head screwdriver
A block of plastic wood (or regular wood) long enough to make a cube (at least 1.5in by 1.5in by 1.5in) out of the wood (or plastic wood).
A small drill bit
Step 2: Preparing the wood
I made mine using a different method. I cut the end of the wood at a 45 degree angle, then I cut a straight line taking the whole slant off and it left me with a triangular piece of wood.