I have two of those things that look like SAK but they're full of allen wrenches of all different sizes and such so I didn't have an issue but I know what it's like to have every size wrench except for the one you need. Very frustrating. I'd go to home depot and pick up something like what I have (seriously, imagine a SAK but all allen wrenches) and you'll never have to stress over this kind of thing again.
The correct size is 3/32. Both my Bondhus and Allen (SAK -like) sets from Home Depot have that size. The tweener scales use a 9/64 wrench, so make sure the set you get has both.
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