Standard Vacumatic Wrench
thingiverse
This is a vacumatic wrench for disassembling Parker standard vacumatic fillers. The threads are 5/16"-36. The wrench is designed to use a 1/4" bolt and nut for tightening, but a 5mm bolt and nut would probably work too. Thanks to Rob Zorn for the thread specifications: https://www.mainstreetpens.com/articles/cheaptools_2.htm. I printed this tool in ABS and used it to successfully remove a filler using the wrench and a heat gun. I suggest using ABS or PETG for the temperature tolerance since you will need heat to loosen the filler unit.
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