ooooh grrrrrrr, the limitations of comunicating in writing!
I did learn from you, Paul about what you call a folded foot, ie. for the strengthening of thin glass by doubling it over.
I was only poking my nose in here because the bowl in question is an example of a
completely different kind of folded foot, and is what I had thought "folded foot" was when you were talking about them at first.
piccies! If you look carefully, you'll see that a dark ring of dust has got trapped in the very fine deep recess of the fold, I left it to illustrate that the recess is there.

I do understand what you mean by folded foot. I was only pointing out, in general, that there other things which can be honestly be described as folded feet. A source of confusion in the terminology.

Not trying to confuse things further, which is what I appear to have done.