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...my personal experience is with using anti-seize compound. It has always worked well for me, in cases where I need to remove or change a freewheel that I have installed previously. I use it on all aluminum to steel contact surfaces. The damaged two notches are a problem that I'm not certain is fixable. I guess you could try to clean the notches up a little by carefully filing. I almost never re-use Regina freewheels, even though they are of high quality.