I just bought a Pearson 33 with a swing keel. The keel is stuck in the up position - I am hoping that is just marine growth. My biggest question is how to replace the wire. It was just loose in the metal tube. Not attached to the keel. I followed the tube to the hatch located on the salon floor by the table. There is a mound there that the tube goes into. Can I unscrew where it goes into that mound without water shooting into my boat? How is the wire held on? The old wire was quite stiff and fouled around the drum. I understand I should replace this regularly (yearly?). Help!