I am the proud owner of a 1997 Sunbird Spirit 170 and have a question about the steering wheel. This boat has a 90 HP Johnson Outboard. Under the steering wheel housing, there is a round knob. This knob will turn and tighten, or turn the other direction and become loose,, but I can't see what is actually happening. Any ideas on what this is supposed to do? <br />Other than that, the boat is surprisingly spunky for it's size. A little small, but at least it runs! <br />Thanks for the help!<br /> 