Locate the 7 BTR screws (circled in red).

From the factory, the screws may be tight and cannot be turned with a screwdriver. Using a BTR wrench, unscrew the screws to loosen 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 has been removed, the motor will open on its own, the motor shaft rising as it rests on the work surface.

Remove the electric motor and motor shaft (which may sometimes remain attached to the motor mount).

Lift the transmission shaft by its large bearing.

Then take a flathead screwdriver and pry out the rear part of the drive shaft.

The drive shaft is out.

Move the motor base forward to the edge of the work surface, so that its arm shaft exit hole is in the empty space. Insert the new drive shaft into the motor.

Remember to grease the new drive shaft with bearing grease or 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 support and the motor base.

Screw the 7 BTR screws back onto the motor