Maybe i should have added more information. i think these clutches are junk. However. they are required in the miniwedge classes here in Michigan. i have been trying to tune them so they function better.. i have noted on every one of them, the weights, only contact partially and on an angle.. like the spring is not allowing the weights to move out evenly parallel with the casing. They collect dirt to the point the weights do not retract to disengage. they are a bear to assemble. i have had people mention that they bought the clone version, but i can't tell the difference. almost all of them have the bully conversion, some have larger vent holes in the drum... i'm just not in the mood to buy one of each ( $180 +) to tear them down and see if there is a difference. wish they would go to a hilliard clutch... much more user friendly