This is where you install a remote receiver, which disconnects the motor when activated. In no time they will contact you for the warranty repair. You then remove the unit because the motor is faulty and never return until full payment. The disconnection yo be done at the most heightened time of use. Receiver and remote costs about R350.00 - as Andy then says, the first service is free where you give it a once over, and remove said device once the account is settled, to be used on the next job. Ensure that the installation of the said device is well hidden where only a pro would find it. Ensure there is a contact number so in the case he calls someone else to repair it, will find the device and contact number and immediately know that the customer concerned is a baddy.