Half Tube Plug (Bottom) is alum. piece which works with Half Tube Plug (Top) to secure the nylock nut in-between, so that the M3x6mm axle screw can secure the motor inside the axle tube. Please refer to exploded-view drawing.
James N.
Tracy T. was extremely helpful in addressing my issues with my V1 unit.
It initially stopped functioning appropriately. It continued to turn in a circle!
She helped me diagnose whether it was in the mother board in the V2 upgrade or with one of the motors.
Once the unit began functioning as I wanted, one of the wheels fell off!
Tracy assisted in finding a replacement part as the original was totally clam shell around the axel which wore out.
She found an upgraded replacement part and put together an order and sent it to me!
Thanks! Happy Holidays!
Jim