I've got a 1981 416 with a non-functioning thru-hull for the aft air conditioning intake. I've never had to deal with thru-hulls before on my 26 ft Chrysler day-sailer, so this is all new to me. What do I need to do to repair the thru-hull, so that it keeps water out when closed? Also, what is the best method for unsticking and lubricating the thru-hulls before the boat goes back in the water?
Thanks in advance,
s/v Sheer Joy