As some warned, this is proving to be a royal pain in the ass. First, the instructions mention a small clamp, but I don't see one. More importantly, I cannot get the rear head in properly. Only 1 bolt goes and I can't seem to get the other to line up. I know others had trouble, but I couldn't find a topic covering it. Anyone have step by step instructions for this thing (the ones came with it are worthless and the pictures too blurry).