So today I decided to finish up exhaust system. I had it mostly tacked up but not welded out. To help remember how it went together I peened the flanges with a center punch. Of course once I got them apart it dawned on me I had only done the flange on the glass pack. Translated the witness marking had zero value as it spins on the glass pack. What an idiot! Anyway once welded up I then ground out a relief clearance for the nut to ensure it gets solid purchase. When I do that I always grab a fresh rock (millwright lingo for grinding wheel) so that I can capitalize on the square edge of the fresh wheel.
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