Looking for advice yet again!

[Dennis]

No, as far as I Know its my own invention, although there is nothing new under the sun, they say.

There's no video, but why not try it?

Filing a flat on one beak does not spoil them for other uses, if you keep the flat on the outside of any curve you make.

There is no need to make complete piece. Just prepare the end of some tubing for a cheap stone, including the bevel mentioned before. Apply the flat to one side at the level of the girdle, and use the round beak to slowly coax metal over the stone at compass points and then in between.

The action of the round beak is like pushing the metal over with a finger. The shinier the beaks have been polished, the smoother the result.

You can also practice finishing and polishing. Releasing the stone for re-use will waste very little metal. Dennis.