Tapping a flange - GIF

Tapping a flange.

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Previously:

https://www.homemadetools.net/forum/...465#post225107
https://www.homemadetools.net/forum/...567#post225446
https://www.homemadetools.net/forum/...857#post223775
https://www.homemadetools.net/forum/...078#post191456
https://www.homemadetools.net/forum/...200#post188222

I'd like to see that from the other side. I'm worried about chewing up that flange mating surface with the vise. I was on an oil and gas site that would completely resurface a flange if there was the tiniest visible scratch on the surface. A ton of people got fired for lightly using a scribe on the surface for layout. I'm pretty sure that was crazy, but that was their site policy. I dunno I guess I can see it on an H2S line or something.