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Perfect Allen wrench selection.
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Previously:
Perfect burger drop photography rig - GIF, video, and photos
Perfect ketchup pouring - GIF
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Perfect tile pipe cutout - GIF
Perfect tree felling between two fenceposts - GIF
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ahhh...so that's what it's like...
I nearly always get it right, (except for those stupid $#@! fractional inch measurements), but it certainly doesn't make me feel like I'm on cloud nine.
Generally, I can eyeball one that is obviously too small and one that is obviously too big. Then selecting one that is midway between those two is often correct.
Of course, this assumes the wrenches are ordered in some sort of a holder, not just a handful of wrenches. Neatness in the shop is more than cosmetic; it can save time.
If " those stupid $#@! fractional inch measurements" annoy you enough, label their (presumed sequential) holder with simple progressive integers representing their size in 64ths. (Thus 2 would represent 2/64 = 1/32 and 4 would represent 4/64 = 1/16. Halfway between 2 and 4 would be 3 denoting 3/64.) Deciding the next larger/smaller size would be trivial.
OTOH, if mental arithmetic strikes terror into your heart, convert everything in your shop to metric and never look back. :-)
Thanks for the suggestion Marv. I'm very familiar with fractions, indeed, my smallest lathe is a Myford Super 7 which has Imperial graduations and I'm "ambidextrous" between both systems of measurement.
The curse is finding the correct size Allen key for a grub screw of unknown origin which is invisibly submerged deeply in a grime filled shaft, only to discover it's not metric.