Thanks. I'll have to admit to cheating when it comes to the "cleaning" part by doing most of the machining after I brazed the tube to the flange. Cleaning won't be as easy with the crankshaft, however. I suppose that'll just involve a bunch of manual work with files and emery paper.
One thing I don't understand about silver soldering is the idea of "pickling". In a couple of YouTube demos, after silver soldering the guy dunked his part in some sort of acidic concoction to "pickle" it. But I haven't seen any explanation of what this is supposed to do.
-- Russell Mac