Bob, I'm excited about the progress you are making! Even if the process only results in some simple ways users can reliably modify these steel nibs to produce more flex that would be awesome. But I also find myself wondering if you might stumble onto something that could be produced at a manufacturer level, in other words a new nib design with feed combination that could be mass produced. Boy wouldn't it be something if it were possible to find a combination that would approximate vintage wet noodle flex in a modern steel nib pen for under $50! This all definitely makes me want to put my thinking cap back on about this possibility. Keep up the good work!
I think I'm about to head over to my desk and try out some of your mods and see what I can come up with myself.
Fountain Pen Revolution