Step 4: Drilling the Bolt Holes
Make a mark with a Sharpie on the front two corners of the plywood base ¾” from both the sides and the front edges.
Put a sacrificial piece of wood beneath the plywood base before drilling. You don’t want to damage surface of the bench! Stack the plexiglass camera stage (7” x 7” piece) on top of the base. Then stack the specimen stage (3” x 7”) on top of the camera stage with ¾” of the stage extending off the front of the base.
Drill through the entire assembly. The bolts that stick up through the base must be countersunk in order for the stand to sit flat. Flip the base over and counter sink the holes with a spade bit.
EDIT: A few tips on NOT cracking the plexiglass when drilling…First, go slow. Let the drill do the work and DO NOT press down hard on the drill. Use a sharp bit and press gently on the drill. You can also put a piece of tape over the area that you wish to drill through. It will reduce the chance of cracking the plexi.