Not yet. I've been considering the lead bath route though. On the few springs I've done I've often broken them, trying to do it like Jack Rowe. I have to make a decision soon, I'm shortly going to be doing complete disassembly in preparation for Case Coloring. I wasn't aware the Nitre bath would work, but why wouldn't it?

I prefer wood to plastic, leather to nylon, waxed cotton to Gore-Tex, and split bamboo to graphite.