elliot, i have a shiny treats crank on the bench, and was gonna lighten the bell myself. the quad shop i mentioned in the article has a vibratory polisher (joke?) that i want to at least throw the flywheel and and bell in the next time they throw in a gearset.
tigging brass with brass rod splatters and oxidizes. what you want is silicon bronze, like butter. it will never start leaking. copper on steel, brass, stainless, whatever. like a metal orgy. obviously no structural butt welds or the like.