Re: Can you sand a neck and make it thinner?
I did this a few years ago just out of curiosity. I used a depth gauge, a small drill bit, 100 - 320 grit sand paper, pencil, curved sanding block.
Made 3 straight lines down the neck (left, center, right) about 1/2" spread then I made about 1 dozen 2mm deep dimples with the drill bit (by hand, no drill is needed) down the center line, about 1mm deep down the left and right lines. I took the pencil and colored in the dimples. Then I made an X pattern with the pencil all over the neck. This is used as a reference when sanding. As the pattern fades you can see where you are putting too much pressure. Once all the pencil is gone look at the dimples, they should be getting smaller. I made the X pattern several times as I sanded until the dimples were almost gone. From that point I used the 320 paper until the neck was nice and smooth. I went slow so this took a while but it did come out perfect. Good luck!