I have an OS 18TM that has been eating both recoils and one way bearings lately. After the last one, I took the recoil off to fix it again, and found melted plastic from the recoil's spool(OWB locked to starter shaft and spun inside the spool) and a coppery looking paste inside the backplate's dished in area. After some further looking, I found that the starter shaft is loose in the backplate as well, so a new backplate and starter shaft have been ordered. I pulled the back plate, and everything inside looks normal, rod isn't loose and the crank can be turned over by grabbing the flywheel. The big question here is what caused this to happen? I have never let it run lean before and I followed the wear in as best I could from the manual that came with the engine. It's got about 3 gallons through it so far, and low on compression. I think that the low compression is from the air leak created by the bushing and shaft going bad on me, because I tune it every time I run it due to weather extremes. I currently plan on replacing the piston and sleeve this spring when it'll be warm enough to be able to break them in, but want to prevent this from happening again if possible. Thanks.