I've been searching like the dickens for information on cog lockrings, like on the Shimano freewheels. Are they right-hand threaded or left-hand? I know their not to be serviced but I want to transplant the cogs, and reuse them. Is their a tool for removing this cog lockring? I tried a hammer and punch counter-clockwise, but it's kind of tough. It recently cut it out of a trashed wheel. Perhaps the hammer and punch will work when I get it on a freewheel again? I hope I can do it without buying a new tool!