First off thank you tvs1320 for the .STL files. I had my brother print them off at work for me.
I am still having an INSANELY hard time getting the piston off the end of the ram. I tried being gentle in the beginning without marring the the end of it, but resorted to vice grips, channel locks, and eventually a pipe wrench WITH a MAAP torch. Still ZERO luck.
I was really trying not to damage the U-seals/oil seals as I only need to inpsect/replace the air seal on the inside of the male threaded cap.
This is very unfortunate after spending a small fortune on these and QuickJack/Bendpak being of no help other than "you're going to have to buy new cylinders". I use my QuickJacks maybe 10 times a year.