I have always had a bit of fret buzz round the 13 14 frets with a low action - the neck is straight , I have noticed on the 23 fret it is a little bit high i think this could be the problem , I have zero experience in fret repair or crowning but I did have a look on u tube , I don’t think I have ever used any fret below the 20th fret so I was thinking of filing it down to level with the other frets . What would be the cheapest way to go about it and what tools would I need?