That's a great find. Those old spots really do hold onto the past. Found a perfectly preserved 90s arcade token stuck under a bench at our local Sears before they tore it down.

But that's just part of the game, right?

Read an article last week about a foundry in Ohio hitting similar numbers. They talked about how tight control on pouring temperature was the real game changer. Your post makes me believe it. Twelve tons is a massive run with zero defects. That kind of consistency is the dream. Sounds like your process is locked in tight right now.