Planing fretboard meant recutting the slots, but a regular saw is awkward, needed something smaller, cheap, that would deepen a 0.020" slot. Have several cheap pocket rules that mike out to a hair under 0.020, making them excellent victims. A little filework using the nice, convenient 16 tpi scale already laid out on the ruler, and I had a nice, smooth cutting depthing saw for the cost of a flea market rule. Compact, rustproof, stores easy.
Bonus extra feature is the 16" grads disappear into the slots when they reach 5/64" deep.
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Top edge doubles as an 0.020" feeler gauge. Be nice to file a hook in somewhere to make a fret slot degunking tool.