I have had this problem several times and it is getting kinda old. The shock rod end will pull right off of the shaft. Once I find all the pieces (spring cup, spring, rubber tube on the shaft) and can reassemble the shaft screws right back in like it is supposed to and feels secure, but I eventually have to go on a scavenger hunt for missing parts. It's not always the same shock, so I don't think it is just wore out plastic. Or maybe they are all wore out and just take turns letting me know. Any suggestions on how to keep this from happening? I was considering just JB Welding them on.