Sheaffer Vac Fil Piston / Plunger Shaft

For fountain pens that use Sheaffer's Vac Fil filling system. Sheaffer's repair manuals list 14 different lengths of these used. If you need one, try to figure out the length (BETWEEN the threads) to see If I have it. Available in uncoated or coated with hard rubber. 

I have these pictured. **Note that the longest I have is 2 19/64". Some of the old Vacuum Fils had longer, but they are rare and I have none.

I also have some hard rubber coated ones. If you need one of them, please use the length between thread shoulders AND THE DIAMETER OF THE TOP WASHER. The nuts on those are tricky to get off and you'll need to do that yourself. If you want an interpretation of which lengths are used in which pens, try studying this link, pages 12 & 13:
The manual is "Manual for Trained Pen Repairmen, 1941; 11/41 No. F29, 25 pp.".  This is the link https://pencollectorsofamerica.org/reference-library/sheaffer/