| Re: What is going on here
OK I think we are talking about the whole valve metal button with thread and the genuine imitation mother of pearl insert.
If they fit before and don't now, then something happened to either the button or stem. If the buttons fit in the C and Eb with no strain, something happened to the stem.
If those buttons were never attached to your Bb, do not assume that the threads are the same. Bach has a lot standardized, but if nothing is damaged and it doesn't fit, it is not the same!
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