The rubber clutch is designed to slip when you hit something to save the drive pin. So the blade orientation may be shifted and the clutch still be good. The condition of the blades is a better indication of clutch damage. Although shifting at too high a speed can damage the clutch without damaging the blades. So if you are buying a used prop and the orientation is wrong, check the slip torque. If it is at the low end, figure the cost of a new hub into the price. . . 😉
