I was able to remove the orifice so that wasn't in while brazing. I took these pics of the one 1/4" flare that's at the orifice. You mentioned rimming which i don't think I've done. At work ive noticed some of the flares they use have the copper folded over producing a sort of rim and a 2 layer flare if you catch what im saying. Is this what you mean by rimming?
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