Originally Posted by BostonFixed
If all else fails, buy/rent/borrow/steal a blowtorch. Heat up the cog, especially around the threads. That sucka WILL come off.
Have you personally (or know/seen) anyone who's done this? It seems that with the steel (cog) and alum. (threads on hub) the alum. hub would expand faster than the steel cog, making it even harder to take off. Of course I don't have any real experience with any of this beyond idle speculation.