No, provided you bend the ends first the bending tool can cope without any extra. Dennis.
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That's strange Bob: it works from here, but if you google: http://mordent.com/toolsapps/ it should come up. That said, it although it has been popular on the forum, I just use callipers on my ring stick and my desk calculator which has Pi. Dennis.
No, sawing through heavy ends can go wonky, so in this instance I just lightly file the ends, using a filing block also known as a chenier clamp, which makes sure they are perfect.
Obviously you don't absolutely need this tool, bottom right of my picture, but I like it. Dennis.
Dennis I tried it again and all seems well ( internet gremlins having fun)
Ok, last word:
Go slowly with the ring stretcher and keep checking on your ring stick, because you can easily pass the mark.
Rotate the ring a little at each press, to ensure it ends up round, not five sided.
Practice with copper, or a scrap ring first to get the hang of it. Dennis.