Recently, the auger on my snowthrower (Ariens 8/24) stopped working. The first stage will work until you encounter heavy snow, then it will stop running while the second stage continues to spin. I've replaced the shear pins, and that hasn't helped. Could this be the gear box for the auger? If so, how hard is it to fix on your own. Also, what would the damage be if it was taken to a shop? I'd appreciate any advice. -Skip.