Yeah, I thought about using a dremel to cut the jacket in half. I just might overdo it and ruin the motor. I'll give it a try.
Like Brian was saying, there may be so much glue in between the cooling sleeve and motor can that it will never come off, or even with a dremel it may fight you the whole way.
Does your application have enough room to just leave it on? It won't hurt anything.
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It's "Dr. _paralyzed_" actually. Not like with a PhD, but Doctor like in Dr. Pepper.