Thanks for that info. I start to think that instead of trying to modify some existing rod easier would be to start with a straight 2,0mm (=.079) brazing rod. That diameter is already close to the first step. The holes in the holder (the one I have) are 2,2mm (=.087) so that would be a perfect fit when the rod is bent. The steps could be made in D-shape with a fine file with the uncut rod supported in a 2,0mm hole drilled in a piece of wood shaped so that it's partly exposed in the middle. Finally cut and bend. Some simple math in a excel table to compare the round and D-shape areas to know how much to file off the rod.