Pen Sac Size Gauge (D8)

An improvement on the White Rubber Company gauge found in pen repair guy’s tool kits in that it has additional holes for 14 1/2 (Snorkel), 15 1/2 (Touchdown), and 17 1/2 (PFM) sizes.  Made from .115" (2.9mm) thick aluminum. The sac will usually fall freely through the labeled hole corresponding to its diameter.  If you have to push it through, you might be in the wrong hole. The size designations under each hole represent the outside diameter of the sac in 64ths of an inch. The number of 64ths is also the sac number. If you're clever like Jim Marshall is, you can figure out how to use this as a knock-out block also.