Originally Posted by
Pars
I think there were some later Campy cranks that had the self extractors that one side was left hand (or maybe both?). From what I recall, these used 7mm allen keys.
The retaining rings for the Campagnolo Victory and other Campagnolo self-extractors were left hand thread on both sides, but the Allen bolt that actually pushed against the ring to remove the arm are standard thread. Unless the self-extractor was removed from the arm for some reason, there was no need to mess with the left hand thread. Shimano and other self-extractors used standard 22 x 1 thread for their equipment.