The freewheels seem to be getting together to protest your rough treatment. I just tried switching freewheels between my Cooper and Miyata. Putting the freewheel remover tool in the bench vice and giving the wheel a hard left twist just as I have done many times before before yielded no results. So, I braced myself and gave it an extra hard twist and "BAM". I looked down and the front jaw of the vice had broken off and almost hit my sandal-clad foot, the freewheel remaining firmly affixed to the wheel. I eventually got it off after a lot of fiddling, hitting a cheater bar with a BFH, etc, but I'm amazed that the vice broke.