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It's probably just hardened grease keeping it from turning, I think some heat might do the trick as long as it's not too much, that would melt plastic parts if applicable.
A mini torch would do it but it could also damage it very quickly.
Apply heat to the metal shaft and gently rock it back and forth.
If you can get to both ends of the shaft I'd try that too.
A soldering iron would be the safer bet, I melted an Aluminum pulley from a Projector using a Mini Torch, they are very hot!
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