My limit is doing a bit of light fret levelling and dressing and i'd like to reduce the nut heights on my P bass. All my other basses are fine altho i think my MarloweDK has 2 very slightly high frets on the A string but not noticeable on the other 3 strings.
I'm not looking to replace frets or build my own basses kind of thing.
Basically a step up from doing a basic set up but its whether or not its worth the cost for the sake of 1 bass, perhaps a bit of work on a 2nd bass.
I do have a couple of steel engineering rulers with perfectly straight edges.
Dave