Hi,
i've got a feeling it's either the battery who's not giving enough power to the motor or the motor who's not strong enough. The motor itself seems pretty beefy but who knows. About the connections it's not screws in the grip it's just metal sleever that makes 90 degrees and connect into flat pins. I don,t know about that it seems to be pretty ok. There must be a logical mechanical reason for the motor to run normally when the barrel points in the air. I'll keep searching and rewire everything to make sure the connections are ok. It looks more like a lack of power to me.
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