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There is a shim in there although only plastic as this seems designed for almost zero(15kg) load but minimum friction.
Interesting that this is role the shim plays. I wondered about that.
I can tell you that when the conical bottom bearing is worn as this may be there is no torque at all on the retainer in the design position. One can make almost a a full turn before backing off to the correct position. I imagine that would allow a little movement if not weight end heavy.
I do remember changing those old rear wheel bearings. I am glad I can pay someone to do that now. The Celestron 1990 fork mount bearing is pretty much an automotive front wheel bearing set on a stub axle.
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