It's o-rings and spacers stacked and compressed, pushing the o-ring out like an expansion collet.
And here it is with a part on it. 
and machined. 
this post was submitted on 17 Aug 2024
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Ohhh I thought for metal. For plastic this makes sense. I'd think for metal it'd come loose.
Yeah for metal, I don't know if I'd trust it. Maybe light cuts.
pretty boring
I see what you did there 🤣
So it’s a lathe?
The whole thing is a lathe, yes, but what they are pointing out is the fixturing on the lathe. Specifically the piece in the chuck that can clamp onto the ID of a work piece to be cut. Which is pretty neat!
Ah got it. Thanks.
And yes, pretty neat!
Ah a Joe Pie classic. If you've seen his videos, you know.
It may have been that one, I'll have to look up Joe pie haha