I have self extractors on my SS/ Rohloff crank. They will do for a 100 uses no problem, on several bikes if needed. I need to carry a 8 mm bolt key anyway.
They are strangely hard to get and seldom used, bizzare to me.
Go search for crank creaks/ broken on YT and BF, few will be sq taper.
Last edited by GamblerGORD53; 05-19-22 at 11:40 AM.