Found what looks like a stone screw

[Masterdan407]

Found a few of these at a old mill site in the water. Just wondering if someone else knows what they were used for.

 

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[PetesPockets55]

Neat but odd! A stopper of some kind?
I don't really have a clue but wonder if ropes could have been run over the grooves to keep this in place?

 

[Bruce R]

Clay stopper for a carboy, I have a couple myself., they’re put in soft to make a perfect fit and they harden over time.

 

[OldNBroken]

Clay stopper for a carboy, I have a couple myself., they’re put in soft to make a perfect fit and they harden over time.

Okay, next "what is it"...What's a carboy?

 

[ANTIQUARIAN]

Okay, next "what is it"...What's a carboy?

This is interesting, because I've never heard of a 'Carboy' clay stopper either.
I found this ad pictured in an old Treasure Net 'What is it' post from 2013.

Now we all know,
Dave

 

[Bruce R]

What is ? I see that here alot.