Is a Spoke "collar" (i.e., spoke well) in deep section wheel replaceable? I have an ~20 year old Mavic Cosmic Elite rear wheel, which has a relatively deep cross section: ![Mavic Cosmic Elite]( The spoke holes in the rim have "collars", which the spoke nipples rest in: !["collar" in spoke hole in rim]( One of these is totally destroyed, I'm not sure how: ![enter image description here]( The spoke, rim, nipple etc. seem fine. I can't find any info on the "collar" online -- is this a replaceable part, or is the wheel toast?

I’m kind of guessing that the “collar” doesn’t serve a structural function and is instead just a fancy washer which makes wheel building easier because the nipple can’t drop into the inside of the rim.

It probably failed because of galvanic corrosion which makes it likely that the others are in a similar state.

You could probably replace it with a simple, normal washer (or the fancy DT Swiss PHR washers), but expect the others to fail soon too.