Oh, BTW, since he machines a hole in the main cap to recharge the shock, the top metal cap (which leaks) cant fit back on anyway, so the real solution to prevent future corrosion, is to buy a pipe cap (rubber with steel clamp) to place over the top of the resevoir and tight down. That will keep all moisture out for good! Would be a good idea to put these on your OE shocks even if they are still good to prevent future failure. The rear as well, although the face down and are as suseptable, but still could have water get in.