The real win is the bartender remembering your order, that's the network nobody tracks.

Honestly, that's a good lesson, but it wasn't the client being useful, it was you fixing your own sloppy work.

40 minutes of rework sounds like a lot for a flange that's just sitting there. Not saying you're lying, but if it took that long to get 6 inch pipe level, maybe the real problem is the prep work before you even grab the clamp. Copper flanges are usually forgiving enough that a couple wedges should do the job unless something else is off. The clamp trick is fine, but it's not exactly a game changer. It's just a clamp doing what clamps do.