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Bob, thanks for the detailed reply. FYI, my crankcase is for the Kozo New Shay. I have screwed my sections together, and punched as you note. But, from my results and your reply I now know I should be doing some clamping as well, since I did have some warping. The copper color I was referring...

That's beautiful work. I am working on a simpler crankcase and have two questions - how do you cool? I have seen people that recommend immersing in water while hot to remove flux or do you just air cool? My limited experience is that fast cooling causes distortion. Secondly how do you remove...