Disconnect battery power before proceeding. Do not use any washers. The joint should be tight enough to give movement significant stiffness. Again, the joint should be tight enough to give movement significant stiffness. Continue with step three on the normal installation. .
Gate opens fine but after closing, opens back up.
Automatic reverse sensitivity is set too sensitive. Automatic reverse sensitivity should be set sensitive enough to avoid injury. Too much closing pressure on gate. Gate is in a bind when closing. Check that battery voltage is over 12.5 VDC when closing gate.