I keep having trouble with the motor torqueing itself back on the adjusting plate causing chain slippage. I even put lock washers on each bolt to no avail. A friend pointed out that lock washers are just to keep the nut tight and not made to stop lateral friction. Sure enough the lock washers were just pressed flat and letting everything slide. He hooked me up with what he called "bite washers". They are just washers with a sharp lip to bite into metal. That seems to have done the trick. Thought this might help someone. Always great info here.