Take 3 different pieces of wood 1/8 in thickness,and 2 inches wide on the center piece, outside pieces 1 " wide,glue them together in a lamination with 1" sticking out in the center. Now you have a lets say 12 inch laminated board with the center sticking out 1 ", slice crosswise every 3/8 and you end up with the pieces to make your nocks. Slice the bamboo down 1 inch and 1/8 wide, glue piece in shape and cut nock to width. Ionnian had a great tutorial on this about 6 years ago, can't find it anymore.