I've been doing guitar repair for 27 years now and I can tell ya it would be next to impossible to get the action at the nut set up right by sanding the bottom. You could get close for sure but you would never get it perfect that way or if you did consider yourself lucky. THis is a top down job one string at a time. To get it just perfect you are one file stroke away from ruining it. That kind of accuracy is not possible from bottom up.
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