On a whim today, I decided to throw a whole mess of vessels to use as glaze testers. (Yes- there are more efficient ways to make glaze test pieces!).
I don't know that I'd ever tried to trim anything with that particular size/shape (more or less like a tall shot glass). Proper nightmare! Between the lack of mass and the high center of gravity, the slightest 'grab' of my tool to the clay and the vessel would want to go flying.
Out of 50 vessels, I lost twelve, and two went flying clear across the room. The dog stuck its head in and nearly got brained.
Thing is- I can't think of a better way to do this. Some kind of chuck? Any suggestions?
For an instant chuck you may have a fired pot already that you can use. But in future trim the test pots on the wheel with a tool before cutting off wheel head, so minimal trimming at leather hard stage, is needed if at all.