So I have a Raleigh XPC Pro Cyclocross frameset.

It's all built up now but there is movement in the headset.

It's a *tapered* head tube so there are the two cartridge bearings of different sizes of course. A dust cap and *two* compression rings (see attachment foreground part only, the cartridge bearings are different size in my situation). Each ring is 1 1/8 inch (i.e. designed to fit above the head tube)

Some threads (i.e. https://forums.roadbikereview.com/co...et-122883.html) suggest its a spare and to leave it out, but I get play in the headset if I do.

Clearly the ring on the left goes into the top bearing cartridge, but I can't figure it out where the other goes?

Suggestions?