Hi, I've recently got a new sprocket and chain (colony cc and odyssey bluebird) the sprocket came with two adapters and installed only one of them, but here is where I think I have messed up, I done the normal things like tighten your cranks etc etc and when I spin my sprocket it moves forwards and backwards this makes the chain become extremely tight then extremely loose, any ways that I can get it spinning normally with no right/loose spots. (The sprocket is not bent) thanks