Let me preface this by saying that this is only a good idea on rosewood, pau ferro or unfinished maple boards. As brought out in the video, it will crack polyester, polyurethane or lacquer finishes. I wish I thought of this easy hack years ago. Have already done it on 2 rosewood fretboards with great effect although I go a lot slower and use more pressure than this guy. Instead of shaving or sanding, you're basically compressing the corner of the wood, which leaves it denser and perhaps even more durable. This plus a fret end dressing = awesome. I have a couple of formerly uncomfortable instruments that now play like Cadillacs and would recommend this technique. Many of you are probably already familiar with this but it was totally new to me. 
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