I have a powermaster 9000 starter in my lambo replica on the 87 gt frame. ever since the install there are three socket head bolts that hold the motor to the gear head that continue to loosen up. looking at the socket on the 1/4 28 bolt it is so shallow that torque is impossible to achieve. I have replaced with a more quality bolt this year with also Loctite thread lock. for a recommendation by the guro archie this is sure a piece of crap. there are also issure with the solenoid connection. its is so cheap. I have had to mill a clamp lock on the connection to secure it. buy something else.