In my attempt to remove the other cap, I made a wooden fixture to hold the cylinder body as shown in the photo. The cylinder is glued to the fixture with 5-minute epoxy . It did take quite a bit of torque to break the cap loose but once that is done, the cap can be screwed out by hand smoothly. The threads are in perfect shape. To remove the fixture from the cylinder , a locking plier was used to tear away the wood bit by bit. The epoxy can stand very high shear stress which makes it ideal for this application but the glue is not very strong when it comes to tensile stress so this part is easy. I am glad that I have used a cheap particle board to make the fixture or tearing it down would not have been as easy as it was. Now it's just a matter of replacing the O rings to get back to business 
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