We own a Simplicity 860SE model 1691777. It started and ran fine today but would not go into gear. My husband found a part loose on the lower left side behind the wheel. The part appears to be a long spring, with a hooked/curved end and a straight end with what appears to be a notch. It measures 13 inches long. We cannot seem to find this part on any of the diagrams, not even the hole the curved end appears to connect to. Can anyone help? It's 10 below and there are 8 inches of snow across our driveway. Not the best time for a snow thrower to stop working...thanks!