GPM uses hollow aluminum which is not very rigid and bents/breaks easily. From my experience it's better to stick to tamiya aluminium for the critical hop-ups (main shaft and shaft drives for example) and 3Racing for your other upgrades which are cheap and good quality compared to GPM.
I managed to wedge a stone between the shaft of a TT-01 and the motor. The stone grinded a part of the shaft. If it wasn't a Tamiya shaft it would have broken
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