Beading Mark .... Not bending
I blame the Black stuff
Here's another of my dodgy sketches !!
Is that what you was thinking Les ?
The lower former could make use of an old woodruff key, inverted & tacked into place .
Or a profiled piece of hardened steel.
The upper former could be made with a small round file or ground out. A tad oversize to the lower former to allow for material thickness ( A couple of mm's should do the trick )
I really must learn to use the Autocad or Solid Edge software I have installed on this PC ....... I havn't got the faintest idea