General rule of workshops….
Bike is booked in with customers opinion of what needs done
Bike comes in and is briefly assessed to tally with what customer would like done vs. what can be seen needs done etc.
Bike is seen on specified day/slot – and assessed fully by mechanic
If within estimate given at brief inspection then proceed, if not..
Then make contact with customer to explain why the e.g. £45 estimate will not cover a rear hub service as thats found to be the culprit of dodgy shifting etc.
If no contact can be made, then personal call of do it or not is made. I.E if its a little over, e.g. estimate £40, actual £48, go for it. If nots more then do not proceed, do not pass go, do not collect £200
I’d have thought that was standard practise?
Esp with higher end bikes where you find exotic grades of bearings in them, exotic cables and pads etc, that your average LBS would just replace with standard, because either they don’t know the difference, or no matter how fancy a cable is, its still kinked/corroded/frayed/buggered and a £2 std shimano is better in that situation