What Is This Thing!

[Tomb266]

Ok, hi to all! I have a 1991 Carver 430 cockpit motor yacht. It is my intent to crawl through and into every space that I can to better know what is what and how to properly maintain it. I discovered a cap on the starboard aft under the exhaust outlet. I unscrewed the cap and there is this bolt/screw that I have no idea what it is or what it does. Nothing in the manuals, drawing or on the Carver website. Any help greatly appreciated.
Tom

[tomschauer]

Most likely the flux capacitor connection point.

Just kidding of course, sent a couple pics, someone will know what it is.

[bud37]

If that is on the transom could it be a platform support bolt and I agree a pic may help......

[Tomb266]

Thanks for the humor Not a platform bolt as it seems to be for some adjustment. I looked inside the hatch on that side and there is a 4" pipe (tube) that runs along aside the hull the length of the starboard side. I will grab a couple of pics when I next go down. I am sure it will be obvious to someone instantly.
All the best!

[Tomb266]

Okay, back from the boat and took these. Hopefully someone can tell me what it is and what it does.
download/file.php?mode=view&id=2511https://www.carveryachtowners.com/download/file.php?mode=view&id=2510

[bud37]

Don't know what that is, you definitely come up with some good ones... .....but you really should look into whatever is rusting there.....something is improper/ needs sealing etc.
Did this boat have transom lights before ?

[throwback2]

Is it a spare shaft?

[Tomb266]

Yeah, this power boating certainly has been a exploration of many unknowns. No I don't believe she has ever had lights. The rusting is among the many similar such that I will be addressing as the weather here in Alaska improves. Spare shift......hum, you might has something there. I think the best approach is to try to remove and see for sure, but that just might be what it is.

[Sadey]

Turn signal fluid refiling point? Oh wait it's a boat not a car, never mind.

[Tomb266]

I thought about that but, I could not find where to replace the bulbs. Ugh! I also thought it might be to adjust or align the boat so it would run straight when under way. We shall see when I remove it later this month. I will post back then.