Join Date: Feb 2011
Location: San Francisco Bay area
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Re: What is this throughhull?
The fact that it is leaking, and stiff, says to me that it is worn. Normally when you adjust them, they will stop leaking when they are still easy to turn. If they are worn, you can crank them up really tight and they still leak.
What you need to do when you next get a chance to service it is lap the bore and outside of the plug, and grease it well.
You could maybe slacken off on the adjustment slightly, see if it becomes easier to turn without leaking unduly.
Usually when they've had any kind of recent maintenance there'll be some grease oozing out around the ends. I don't see any on yours.
Bristol 31.1, San Francisco Bay