db wrote on Sep 29^th, 2010 at 7:15am:

Today's thing. I've seen a number of these at similar locations and have always wondered how they inserted them and how long is that eyebolt or whatever it's called?  Sometimes the stuff humans did/do simply amazes me. I'm hoping this is one that someone can easily educate me on. Brownie points will be awarded if you can explain how they were used and/or why there is no rust to be seen?

db,

As pajeff says, just check out the story & the pic in this BWJ issue.   Same danged ring at the Conk campsite, I'm guessing.

As written in the story, they were once used to tether the fabled and (allegedly) extinct Jackfish... which, of course, were puny suckers compared to pollyhumpers and some other fish I've heard tell about on QJ.  PJ catches & releases equivalent-sized fish regularly.

Anyway YOUR pic IS the BWJ pic minus the people & plus some flotsam & jetsam in the water.

Jimbo   8-)