Resistance stacking was a large lesson: each tiny variance substances across assemblies, so shop illustrations specify spaces

https://www.scribd.com/document/1058364989/Why-the-Most-Requiring-Designers-Specify-Custom-made-Copper-Finials-And-What-They-Become-in-100-Years-150365

Tolerance stacking was a large lesson: each little inconsistency substances across settings up, so shop drawings define spaces, shims, and slot sizes to guarantee a perfect site fit.