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@tynan
20Nm is very very low for a crank mounting bolt !
I use my 1-20 Nm for all the smaller bolts (stem, headset, seatpost binder, saddle . . . and so on) and use a 20-110Nm for heavier stuff - set at 40Nm for Sugino 75 crank bolts.
Even something as small and light as an alloy (not even steel) chainring bolts take 8Nm - that's why I say a 1-20Nm wrench is too low for mounting cranks.