After having some belt problems on my Craftsman L3000, I took the deck off. I notice that the left pulley is not in line with the right pulley or the two relay pully. The left pully is a full inch lower that the other three. None of the pullies have been changed in any way. One tech looked at the deck and said it appears that it needed a spindle an inch longer, but in that case the cover would not fit. It came from the factory this way and I have mowed for years with no problems. I am going to clean and lubricate the movement of the center pullies. I don't know the correct name for them, the ones that use the back of the belt. Can someone explain this difference in height, lack of alignment.?