I recently purchased about 15 year old house, I have Sears's craftsman 1/2 HP automatic garage door opener Model# 139.53513. Anyone idea how old this garage door opener would be? It suddenly stop working and when I opened the unit it looks like plastic gears are worn out. Is that something I would be able to fix it myself. I do not have owner's manual.
Do you think it is a good idea to buy new garage door opener? any recommendation on brands? Should I buy chain or belt drive?