The other day I was using the sno-thro attached to a gt 18 garden tractor. I heard a quick ping and metal on metal like a shear pin was thrown and bounced. The augers stopped spinning. Both shear pins are intact. The shaft is turning and the belt turning as well. I’m not well versed in snowblowers but it seems to me in the gearbox went then I would have heard grinding or some terrible sounds. Does anyone know if there is another shear pin or some other simple fix? They are predicting 20 plus inches of snow this weekend and I have a driveway about 200 yards long!