Greetings: Here's my problem. When I am on the mooring at night with the tiller locked in the midships position, it seems to clunk ever so slightly. Now she is on the hard, and before I do any drastic digging to drop the rudder down, I was wondering if I am missing some maintenance issue here? Climbing in the battery compartment, I see a grease fitting on the rudder tube. What kind of grease does it take and how much? And does anyone think this would help? Thank You for any help you send my way.