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Any of those cans that have wheels have an axle that runs through the bottom of the can. FWIW, I have two of the Rubbermaid Brute cans that I bought the dollies for, that I use for making and storing my SW. I've been using them for about 5 years now, without a problem.
At this point you might be better off just leaving it where it is, if it's not stainless, it should just dissolve. I think you'll do more damage trying to get it out.
Here's a good article on Ca reactors:
http://reefkeeping.com/issues/2002-05/sh/feature/index.php
and here:
http://www.melevsreef.com/calcium_reactor.html