This project only requires a few things:
I got mine from the fine folks who work at the Computer Museum of Austin
during Maker Faire Austin this year, but you can take any old keyboard and wedge a screwdriver between the keys and the keyboard to break them off.
The heads of thumb tacks are just too large to fit inside the well on the back of the keys. Classy map push pins are the perfect size. I used something like this
- Dremel tool, or a pair of pliers, or small hand saw, or an exacto knife
- drill with drill bit to match the diameter of the head of the push pin. Mine required a 3/16" drill bit.
- hot glue gun