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Looks like the Korean group buy springs will arrive this week. Hopefully the rest will arrive by end of next week.
You might plan to do sorting by weight.. and guarantee people +/- certain number of springs...
You have 160 sets to count out..
I just sorted 100 grains of rice by 10s, took me about ~15seconds..
so 160 sets would be about 40 mins if you were a machine..