Tolerance stacking was a large lesson: each little deviation compounds across settings up, so store drawings specify voids

https://www.scribd.com/document/1039869947/Salvo-Metal-Works-and-the-Truth-of-Copper-Personalized-Chimney-Shrouds-that-Endure-183965

Tolerance piling was a big lesson: each little variance compounds throughout assemblies, so shop illustrations define voids, shims, and port lengths to make sure a perfect website fit.