

I think for me it would have to be the levelling & dressing of frets for the first time. I've always had a dislike for repetitive jobs ever since my apprenticeship where you got all the crappy production work so if there was a machine that could level,re-crown then polish the frets to a level I would be satisfied with while I had a cold one, I think I'd be bloody near the front of the line to buy one.

Fortunately as my technique has improved I've gotten to a point where I don't have too much leveling work to do but it still requires repetitiveness & time to do the rest.