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I just finished repairing five same-make/model F-attachment trombones.

The very last one had a rotor cap that would nearly tighten, but - just at that point - it would continue to rotate and spin off the valve casing.

I repaired it in ten seconds, and without messing up the casing, nor the fit of the rotor, and nor the fit of the removable rotor bearing.

How did I accomplish this?

By saying nice words of encouragement.

JB Weld.

swapping the cap with one on another trombone...

...Both of them work as they should, on the other instrument.