Please help me identify this broken part(?) from my 904!

66Valiant528 said

Looks like a broken magnet .....

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crj1968 said

Yeah does look like a magnet piece being black inside...is it magnetic?

100% sure it's metal and not old hardened rubber?

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Yeah, that thought crossed my mind. Its not very magnetic anymore (doesn't stick to trans pan) however it does react with a strong neodymium magnet so I do know that it is metal and not rubber.