Sanding blocks are 1/8" neoprene foam (mousepad) glued over 1x2 & 1x3 scrap pine, with 1/4" roundovers ( makes 3/8" roundover with padding. ) Use waterproof contact cement. The large block is sized for 1/4 of a standard sheet of sandpaper, and will also take half of a 1/3 sheet piece. Small block works well for details, inside horns, etc. The neoprene grips the sandpaper exceedingly well, wet or dry, and has just the right amount of 'give' for very fine sanding.
Sanding is one of the most important aspects of woodwork, and luthiery. In general, if there is a choice of method between sanding and something else, routing for example, sanding is much safer and preferable.
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Here is my bench-top belt sander, rotated up vertical. I've never been very impressed with this thing, and it has seen very little use, especially since I got the oscillating sander. But I thought I'd get it out and see what it might be good for. You can see there is no abrasive on the sanding disk. The disk doesn't do anything the belt can't do much better. Sooner or later though, you will forget it is there spinning away, and find it with a knuckle or finger - ouch. At some point, it also tore up the power cord. I took the disk off to clean it, and I was tempted to leave it off - the spinning nub is much less dangerous. But the back of the disk is the cooling fan for the motor, so I put it back. The smooth aluminum is fairly safe.
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