A crank, a rod, a slider. There is one thing you can change. Try zero first, since you were going to anyway.
nothing moves. nothing can. perfection has seized.
Engineers put tolerances on dimensions because they know a secret the rest of us keep relearning: a machine built to exactly fit does not run. Metal swells, floors settle, people have days.
The gap is not the flaw in the design.
The gap is the design.
Too little and it seizes.
Too much and it rattles.
Somewhere between is a thing that expected reality.