One problem with the design of the snowblower is that snow can build up in the auger, jamming it and stalling the motor. This is complicated by the fact that the auger may twist before applying enough resistance to the motor to stop it. If the jam is cleared with a hand, it is possible for the auger to return to its natural shape suddenly and with great force, possibly injuring the user; snowblowers are a leading cause of traumatic finger amputations. The correct procedure is to stop the engine, disengage the clutch and then clear the jam with a broom handle or other long object.