I had a problem with air in the system and bled it. It worked fine for a while but started to get spongy and the fluid got low. I bought a seal kit for the ram. I inspected the shaft and didn’t see any obvious scratches or cracks. Upon further inspection,using my fingernail, I found a tiny, what appeared to be a crack. I cleaned the area well and then mixed up a small amount of jb weld marine. After putting a very small amount over the area and letting it cure, I carefully sanded it with something like 1000 grit paper. Installed the kit , bled the system again and that was a couple years ago. Still holding (knock on wood).
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