Used to repair loose or drooping coupler box covers on Athearn equipment. Coupler height is critical for trouble-free operation of your equipment.
 
The Bulls Eye Drill Jig is used as a guide to drill a hole through the center of the coupler box-pin so that it can be tapped for a 2-56 x 1/8 screw. Designed to be used with a #50 drill only (#116-11001).