I use one of these in conjunction with the bowling ball compass. It's the nut as you can use it to rapidly layout in terms of just pin to PAP or pin and MB to PAP as well as be a great tweak fro when your dual angle layout drills out ½ the pin, as often happens with longer spans. Any driller conc...
Cute... :)
Jeez, if it hurts that much to tilt your head, fiddle with your video settings...
Cry babies...