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Shoe sizes need to go too. Just measure it in centimeters. List all the measurements - length, width at forefoot, midfoot, rearfoot. Let people go online and look up a list of shoes that actually fit perfectly. Instead we have three or four different variants of shoe size numbers, gendered, that don’t even work with width, and half the time are too big or too small.
The pumps they sell for coffee syrup dispensers maybe.
Also they sell non-medical syringes for general use.