I finished up a project DIY guitar and brought it to Ron, the guitar luthier/ guitar tech for a fret level crown and polish. I was a bit worried since he said the neck needed to acclimate to have strings on it and advised putting heavy strings on it and let the neck correct its convex shape and to give it sometime. I came back a few more times but it still wasn't straight enough to do the fret leveling. And then finally last week he said it could be done. When I got it back the frets were level, smooth and the guitar has perfect normal/low action. Even the sides of the frets were smoothed out and there are no traces of scuffs from the file. My expectations were truly surpassed, the intonation was perfect as well. I would absolutely recommend this service to anyone.