Parker Vacumatic Tap Tool to Straighten Bushing Threads

A TAP FOR STRAIGHTENING OUT THE THREADS IN THE CLIP BUSHING IN THE CAP OF A PARKER VACUMATIC / 51 AFTER YOU'VE REMOVED THE BROKEN-OFF PLASTIC CLIP SCREW ("JEWEL") FROM THE BUSHING.  
Clip screws sometimes shear off when you're trying to remove them when you need to get at the clip bushing slot to remove the clip. You then have to use a bud burr and/or a pick to break-up the threaded part of the clip screw ("Jewel") that remains stuck in the clip bushing so you can screw a replacement clip screw into the bushing. After that, the threads are usually boogered-up, preventing an easy insertion of the replacement clip screw ("Jewel"). This tap will solve that problem for the second smallest size of clip screws (both of the smaller sizes frequently shear off). This larger of the two smaller sizes is more often used on pre-51 Vacs, but some 51s use this size also. The pre-51 Vacs also use some much larger thread sizes, but those sizes are less likely to shear off. That's why I offer the smaller 2 sizes here (see next item also). To determine which size you need, this larger one is for clip screws ("Jewels") with a thread O.D. of approx. .118". if you don't have a micrometer, try comparing the thread size to a known drill bit size.