Agreed with the Marco bending tool post. I attached it to a 2 x 4 so it could be put away easier.
If needed, I can clamp that to my workbench to secure it, but have had no issues just putting it on a flat table surface.

I did splurge for the kit so I have the various sizes from the sample pack. I had no problem in replicating a missing wire guide from a Bally Rolling Stones.

Perhaps just experiment with it on an extra piece of wire. With patience you will get how much is needed for the bend radius.