[In any universe, in any time, those are one and the same for Doc.]

Ah, not at all! [Sifting through the cluttered materials on the surface...] I'm afraid much of what I have here is still somewhat crude. [He may certainly think that, but most would regard his crude prototypes as finished products.]

And a small difference - well, it's a small difference between hitting a target or not, isn't it? Even the slightest percentage increase in accuracy can be the deciding factor between life and death and, frankly, I'd much prefer you to be on the right side of that decision.