Yes, $20 may be steep. I did tell you that it would be cheaper to buy a set of files and do it yourself.
I run a small business doing guitar repairs and mods as well as designing/repairing and modifying tube amplifiers from my house in Holland Drive.
If you ask around, people know me as Mark, Mudmechanic or the Engineer.I also do work for Luther Music.
I´m happy to advise you how to do somethings by yourself for free, but if you want me to do something for you, then you will have to pay.
cheers,
mark