Re: table saw use?
P S i didn't mean to imply that truss rods run parallel to the top of the neck. before cutting the slot, i attach 1/4" plywood strips to the side of the neck blank at an angle. the top edge of the strips are flush with the top of the neck at the body end of the neck, and the strips are 1/8" proud on the nut end of lthe neck. this gives an angled channel for the rod which is deeper at the body end. measurements may vary for different people. this may not be vintage correct, but it works well for the necks i have built.