I have two C-Spanner wrenches to loosen the locking ring on the bottom bracket for vintage bottom brackets. One, Park Tool HCW-5 has a single pin to go into the gaps cut in the lock ring at one of its ends with the other end there are three pins, while the second a Campagnolo tool has five pins to fit into the gaps of the lock ring. So many lock rings look like they have been chewed by a hungry dog, with rounded out gaps or partially broken corners from a C-Spanner twisting out of perfect engagement under pressure and damaging the lock ring, thus my evolution from a single tooth spanner to the five tooth Campagnolo spanner, but then I came across these C-Spanners.


As you can see one has a plate added (Shimano) while the other has an indent stamped into it (Campagnolo). These would seem to be a great improvement, allowing multiple engagement of the lock ring by 5 teeth, while allowing you to press the teeth tight into engagement against the plate/stamped indent so that they do not slip out/off under pressure, eliminating damage to the adjustment ring gaps.

Has anyone used such C-Spanners?

Do they work? Are my presumptions on how they should work better true given your experience?

Again my thanks for your thoughts and advice.