Seasic:
I said in the other thread that this problem requires immediate attention. Your pics confirm that! No competent
marine mechanic, not conscientious owner, would have tolerated such an
installation. This is one of those situations where "good enuff" ain't!!
A "short haul" means hauling out the boat with a Travelist of similar, and leaving the boat in the slings while you do the work required. Because no blocking is required, and therefore far, far less labour is required, the
price of a short haul is far less than for the full haul required to set the boat
on the hard. Around here, about C$400 for the short haul.
If you know what you are doing, the time you need to be in slings for this job is about an hour. The job is, as boat
maintenance goes, a piece of cake. But you gotta have your ducks in a row! Another characteristic of this job is that the long way about is the quick way home.
From where you are at now, there is no choice! You gotta buy a new sea-cock complete with through-hull fitting. So do that, and study its construction at home so you can visualize what the job at the boat will entail.
What I would do, is take a standard 4 1/2" grinder (a hunnert bux at NAPA Autoparts, or even less for a cheapie for one-time use) to the boat in the slings. Grind off the OUTSIDE of the through-hull fitting without doing anything on the inside. Don't try to "save" anything - it ain't worth it! When you are down to flush with the hull, stick something like an extension for a socket wrench into the remains of the through-hull and smack the extension with a maul (heavy hammer). The whole issue will pop right into the boat and you will have a clean hole in the hull. Your
interior backing plate looks okay, and if it is, you can now install the new through-hull using
sealant in the whole. The new sea-cock should screw right onto the through-hull. Do that and make sure it is closed. Then splash and finish the rest of the work with the boat afloat.
TP