Things You'll Need
Instructions
Cut one end of each 15-inch board at a 45-degree angle. Cut the pointed ends off, ½ inch away from the end.
Measure 1 ½ inches away from the end of each board that wasn't cut and drill a 3/4-inch hole that's 1 inch away from each 15-inch edge. Drill on the side that you first cut in the last step. Drill another 3/4-inch hole that is 8 inches away from the first hole and also centered, 1 inch away from each 15-inch edge.
Drill a 1/2-inch hole perpendicularly through each of the 3/4-inch holes. These holes are centered on the board just as the holes in the last step were drilled.
Insert the caster-nuts into the 3/4-inch holes and position them so their 1/2-inch holes are parallel with the 1/2-inch holes you drilled in the last step.
Place the pieces of wood next to each other so the 1/2-inch holes on both boards are aligned and so the longest sides of the boards are against each other. Screw the casters through the caster-nuts so the pair of casters point toward each other. Loosen the caster that is closest to the ends of the boards and tighten the other caster to secure objects you need to glue.