I would greatly appreciate any ideas.

Thank you.

73,
Jeff
N6MNI

Jeff,

Have you tried freezing it? I don't know how large the rest of
whatever it is attached to is and, thus, whether you can put it in a
freezer, but freezing metals generally causes them to shrink (heating
causes them to expand).

Machine shops sometimes freeze press-fit bushings before attempting to
press them as it makes them a lot easier to press into the bored
holes. Sometimes they will just drop in place and when the assembly
reaches room temperature, they are locked tightly in place.

Barry - N4BUQ