The Synchron motor drives the Brass Cam PN 3003 which actuates the Pause Switch PN 3024 to produce the On...Off...On intermittent motion in the automatic mode. It is attached with simple screw and nut connection for "minimal tool" installation but the screw and nuts are tiny. Replacing the motor requires either reusing the existing Brass Cam or installing with a new Brass Cam PN 3003. A 5/64" Allen wrench is required to attach the Brass Cam.