Neighbor's late 90's Landlord (engine model 303777-1111-A1) starter not working properly. Removed the shroud and the ring gear is all chewed up. The ring gear and starter teeth are metal. The Briggs flywheel is 808766, but no replacement ring gear was mentioned at the parts site. New flywheels do not appear to be available. The starter teeth appears to be in good condition, and starter bolts are tight. Not sure how the whole ring gear got worn down. He has only owned the mower for 4 months. Is the only solution is to find a used flywheel with good ring gear teeth, because the existing ring gear is non-removable?