I just replaced a fork seal, and something troubled me. I don't know the names of these parts, so forgive me. There is a a large valve type thing that slides up and down the cartridge tube. When installed this gets pushed up by the spring. Now just above that there's a washer and a small part that looks like a bushing. These are held in place by a snap ring on top. My question is: Is there supposed to be a snap ring below those bits as well? There appears to be a groove for one, but there was no snap ring in place on my fork. I was alarmed because those parts seem to have been moving a bit and I can see wear marks on the cartridge tube just below the groove.