IG @gbrettin:
Screw the putty wanna be JB weld. I literally touched the stuff and the tab fell off. The good news is that it looks like it can be welded after I cleaned the compressor and opened it. If that goes sideways... Then I'll be getting a new AC compressor. Annoyed still, but working through it.
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TBH, I'm glad it fell off. I was doing a compromised solution. The compressor is prepped and ready for my buddy to do a weld.