I purchased a XT HollowtechII crankset used, and it's the first one I've worked with up close so I don't have a good reference. I need to replace a couple parts, and after talking with a couple people I think something weird is going on. I can see the cartridge bearings pressed into the cups, but apparently there's supposed to be another seal on top of them which seats into the cups. However, that seals not there, and I don't see any groove on the inside edge of the cups for it to seat into anyhow. Could someone please explain what's going on here?