Missing a few pics before this but I'll do my best to explain. I transferred the size of each beam to a fence and marked it. Then drilled out most of the waste with a 1/2 in bit. Chopped to my marks using a 1/2 in chisel as the hole was slightly under 3/4 in. Next I drilled a 23/64 hole and threaded that with a 3/8 bolt. Found it to be a little big but holds. Using a bolt works but probably would be easier with a tap. The pin is a 6d finishing nail and is placed a 1/2 in from the end and centered in the beam. I used a 3/8-16 x 1 thumb screw for easy adjustment.