This thing did not cost enough money. $20 retail, delivered to the store. I could have got it for $13 fro rockauto.com. Obviously someone isn't getting paid enough.
It's not very precise, but good enough for my needs. Maybe I overestimate labor required [fabricated from a long strip cut and rolled into a circle; not cast like The Old Days), but that would be unusual.
Here's a video of it rolled on the floor; very satisfying. I got the error message "cannot upload a video to a post with images" which seems odd to me but whatever. It draws a nautilus shape, a spiraling toroid disappearing into a circle.