Until fairly recently Campagnolo RDs used a 10mm x 26tpi thread as did their rear axles.
BTW -- While I believe that they changed to 10x1, I can't state that as an absolute fact. But, if they did, it would probably have been about 2001 when they introduced 10s and changed the RD geometry entirely.
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Last edited by FBinNY; 12-24-15 at 07:37 AM.