Locate the 7 BTR screws (circled in red).

From the factory, the screws can be tightened and will not be turned with a screwdriver. Using a BTR wrench, unscrew the screws to release them. Once the screw can be turned freely, you can use the screwdriver to go faster.

Remove the 7 BTR screws from the motor.

Once the last screw is removed, the motor will open by itself, the motor shaft going up because of its rest on the work surface.

Take out the electric motor and the motor shaft (which can sometimes remain attached to the motor mount).

Lift the transmission shaft by its large bearing.

Next, take a flathead screwdriver and pry out the rear portion of the drive shaft.

The transmission shaft is out.

Move the motor base to the edge of the work surface so that its arm shaft exit hole is in the void. Put the new transmission shaft back into the motor.

Remember to grease the new transmission shaft with bearing grease or with the excess grease in the motor.

Reposition the arm shaft in the motor base.

Reposition the electric motor on top of the motor base.

Check that there is no gap between the motor mount and the motor base.

Screw the 7 BTR screws on the motor