I have a hard time to understand how Art56GearPlate_01 is supposed to operate. It appears to be connected using one ball bearing, and one nut and bolt that is anchored in Art56MotorCoverRing_01 (hidden in this view).

I understand that the ball bearing is fixed to Art56GearPlate_01 but I expect that I need a second ball bearing otherwise it will rest on Art56MotorCoverRing_01 and plastic on plastic does not make a good gliding surface.