It's actually fairly straightforward. Large e-clip holds the cannon assy into the bushing assy that attaches to both sides of the playfield.

Unscrew the bracket with the motor on the underside of the playfield. A pin running through the motor shaft keys it to the cannon.

Pull said e-clip. Unplug the connectors for the cannon solenoid and switches. Lift assy out top of playfield.

Clean the bushing and the motor shaft with your solvent of choice. Put back together.

thanks John will give it a try. Just stuck on my ToM problem at the moment.