I own a Lawn Boy Model 10552; Serial 23000-6713. Today the recoil starter mechanism broke. Rivets wore through, device was mis-aligned, broke the "dogs", (the two levers that pop out to engage the starter cup.) Part number is 99-6713. Numerous sites list this part as discontinued. Would anyone out there have a used one for sale, or know of a source for new or used part. Do any other recoil starters interchange. Thanks for the help!