I have a spare, (parts? ) engine that came with the Cub Cadet 100 that I have been working on. I took the bottom of the engine off to swap with the engine in the tractor as that one has problems with the drain plug threads and it is aluminum and the other one is cast iron. Anyway, in the crankcase was a small piece of steel about 1/8" x 1" x .050" thick. It has a small hole in one end, a place on the other end where something contacted it, a small round shinny spot. There was a small rivet there too that fit the hole. Anyone know what it could be? I don't know what the problem with this engine was, the story was that they had replaced it with the engine in the tractor. It may be OK. I may try and start it someday but I don't have the carb, or another not being used starter generator to put on it so maybe not for a while. Inside it looks OK but I haven't checked the rod bearing for clearance or looked at the cylinder to see if there is a big ridge at the top. Thanks, Tom