Hello, Hoping someone here can help me out. I purchased a replacement sprocket for a 66cc Skyhawk Grubee. The sprocket came with the keyway much wider than the Wooddruff key that came originally. Has anyone encountered this problem? I think the engine is a few years old. When I call the vendor they said that the shipped sprocket is the only part exist and should be interchangeable with what I have. Can someone help me with a suggestion as to what I can do to make the new sprocket work.? the existing key is a halfmoon wooddruff key. Thanks.