I had to use one of those small keymaker`s files on one of the locknuts (rounded,the wrench wouldn`t fit)-didn`t want to spoil the wrench...but I proceded with springs & seals change,so I collected all the shavings...I also bought a set of new locknuts and they seemed to be a bit harder and of different alloy(although the rest of the old nuts were allright ,heightwise too). Mine is a Hazet set of 2 shorter wrenches+the retainer,the nuts need a torque reference of 20-30Nm IIRC.