Well, I received the other day a very nice white dot Sheaffer early Touchdown fountain pen from an ebay auction. I really like the fatter but shorter barrel on this model compared to the Snorkel models.
However, the ink flow was very poor. I decided to try to spread the nib tines a little; first I used Tryphon's brass sheets, but things were going too slowly and I pulled out the razor blade (I know, I know). In trying to force the tines apart, one side broke off (maybe a millimeter). I was furious with myself for not being more patient and careful.
Then I decided, what the hell, I had nothing to lose. I read the various articles on nib shaping and smoothing, such as Wim's. I went ahead and ground down the unbroken side of the nib, and then smoothed it into a modified stub. Not much line variation and not as good as Richard Binder would do, obviously, but I was very happy with the result. It is a very smooth, beautiful nib now.
I'm so happy that I could save this pen.
Ron
PS I would encourage others to experiment first on a cheap nib, as I did with some old worn out Esterbrook nibs. My first few experiments did not turn out so well.