In short: I think there are often better ways to make tubing, which is what this shaping step does. Plus, of course, that one can often buy seamless tubing- though, granted, not in Pd, which the project was about. I think I'd prefer to lay out a truncated cone, though, and tap that into the bezel block, for a better and easier fit.
The new Trinket Ring is back together again. Tomorrow- probably- I will start making the setting in it (again), as warm-up for settings in another piece. I hope I don't break another bit- that was SO annoying!