Go to a muffler shop and ask them to go at it with the air hammer and a properly shaped dull chisel. Have them set the tool for light blows, and do any notch for 5-10 seconds, then switch to the next notch. If it doesn't come free after doing each notch twice, repeat with a higher setting.
I've never had one that didn't come off in a few passes at pretty light settings.
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Last edited by FBinNY; 08-10-15 at 08:16 PM.