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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Laying out for the angled double lipstick bracket. The straight one is at the left, in the center I have cut out my drawing and Scotch-taped it to the aluminum blank. Then I punched the centers through the paper. That's what the black tool is - a spring-loaded punch. It is used to make dimples in material to accurately start a hole. If you don't have one of these in your toolbox, get one - under ten bucks. It works great on woods and soft metals, and even mild steel. The accuracy of your drilling will improve tremendously.
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