that's an easy one. set the jib so the 5 degree increments are facing up. then put the prosect on the jig with the rib facing north/zero degrees and the ruler going across (left to right). then with the zero mark of the prosect in the center of the hole put a mark at 20 degrees. Now draw a line from the mark you made thru the center of the hole. turn the jig in the press so the line you drew is now the new zero degree line. put the slug in the jig and set it at a right hand 55 degrees. Now you have 75 degrees. 55 plus the extra 20 degrees is 75 degrees.
Chris
BuddiesProShop.com