Place your template at the BOTTOM of one of the 4x4s, and flush up the bottoms. Mark this face “side” and then transfer the 1/2″ hole to the 4×4. One easy way to do this is with a 1/2″ brad point drill bit. Just place the drill bit in the hole, and tap it firmly w...
Take the three pieces of 2 1/2" x 1 7/8" plywood (you could also use Delrin or MDF) and cut them according to the drawing. Drill and counterbore the holes for the mounting bolts. Drill and tap the 1/4" Aluminum rod for the 4mm bolts and insert them into the blocks (make sure...