heat the whole area with a propane torch - not extremely hot cause you don't want to weaken it - immediately put an ice cube on the stainless (and not the aluminum) for a minute or so then hit it with a hammer. Aluminum thermal expansion being much more than the stainless should work in your favor. It may take a couple of trys. Obviously, first make sure nothing else around to burn or explode.
edits: first put a wet rag around the shaft to the cylinder and on the cylinder itself - you don't want to melt the seals. And wait for a better solution first - this is more of a last resort.
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