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Bros, some threads ago we found that metru build arm posability fix.
I checked it myself and i tell you, its must have, not only it fixes problem but you still can use torso mechanism if you want (not on picture but you just use gears instead of axle connector , for no mechanism you need angle 4 connector, if you want only one arm then you use that connector from zamor launchers).
It looks better on metru shoulder compared to nuva shoulder.