I tried keyboard keys a while back. I sanded them flat (the bottoms were slanted) and then filled them with epoxy. I tried sitting a bolt into them, but when the whole thing would screw down, the bolt would always come off. Next I made some out of sculpy (sp?) and I set the bolts in while they were cooking. Didn't work. The all broke into tiny pieces when I tried screwing them on. Does anyone just use snaps for connecting the back and collar and put decorative glued down cubes? I'm out of ideas