i have had this debate with loads of people, customers, Cycle training staff and other shop work mates. Generally, the bike trade dont charge enough, Take BMW, they charge around £100 a hour, thats a lot of money, service your M3 and thats a few hundred quid. With the right Qualifications ANY good shop shouldnt be charging pennies, aroudn £40-50/hour is a good price. A Full service (takes around 3hours) should cost between £120 and £150, a lot of money but it Should be done. £50 to do a lockring is rediculous, they are having a giraffe but by the time the cranks been removed (£8-10) and tightend up (£8-10) its about right, 20-30 mins if all clened and greased properly, Sure we could all do its in a couple of minutes but you are paying for their time, use of tool and a guarantee that if it does go tits up, they will pay. The reality is we charge only £20 for a standard service (30-45 mins) and only £50 (at the minute) for a full service, that way under charging. The reason? other shops dont charge 'proper' prices either, we are cheaper but we ll charge too less for it. Its a business not a hobby. we Would probably charge £10 for that lockring 'repair' to be honest, if it was added to a service and that price would come down. good luck with it i say.