Haul it...
When I bought my former 31 4 years ago, I had the same dilema. I pulled the boat and we replaced all thru hulls with the ball type shut offs.With two of the replacements, the actual thru hull worked loose when we removed the valve. We resealed it and it held when we launched the boat. (Search this site, someone gave helpful comments about using an oversize socked (?) to hold the thru hull from the underside to prevent loosening.)Point is that's something you would not want to deal with in the water. You'd have a potentially serious leak and would have to head to the marina for an emergency lift ($$$), or have a great bilge pump with lots of battery power.If you search this site, you will find many postings on the compression post problem. If you did not do it at survey, have the mast lifted/removed and reseal the hole with the wires running into the compression post. DO NOT DELAY DOING THIS! If it has not done so, it will probably leak and the damage is far greater than the simple repair. $150 or so now will save a lot of time and concern later.Don