Chain tension is a tricky thing, yaar — one link too loose and the chain slaps the guard, one link too tight and it snaps on a pothole. I always go by feel, not the ruler, bas.
Arre yaar, that's the same thing with the BP machine on the general ward — one digit off and the patient's either getting water tablets they don't need or missing the ones they do. We both know what happens when we get lazy with the margins, na.