Trying to change belts on an old Mongomery Wards 8 HP (B&S) snowblower. model# TMO35268-B MFG date # J024B. Not sure of age. Auger belt was shredded. Odd looking auger drive pulley is pictured. Is this broken or missing a part? The attachment bolt only secures a thick, flat washer. Second pic. shoes it removed. Doesn't seem to be a good surface for a conventional V belt to ride in. Thanks in advance.