Re: setting points on a 6 h.p. evinrude
The nominal .020" is only a "good enough" approximation anyway. If you want to get then truly correct, use the timing fixture and meter method as described in the manuals. After using the fixture, you may find that they aren't .020". The fixture is correct, the gap method is second best.
What really counts is "when" they open, not "how far" they open.