All this talk about string spacing has got me a little concerned. I have a Warmoth guitar with the Vintage Strat flat mount, and also that has two Duncan Gibson spaced humbuckers in it. And yes, I've always been bothered by the visible difference between string spacing and width across the pole pieces. The strings from E to E measure 2-5/32" across, while the pole pieces, from center to center across measure 1-15/16". That's only 7/64" difference, but it looks bad. I'm wondering how much effect this is having on sound quality. To me the guitar sounds fine, but I suspect I'm missing a little of both highs and lows. But how much? The width of the magnetic fields from the pole pieces surely make up for some of the difference, don't you think? Maybe I'll have to look at more Fender-spaced pickups or a narrower bridge for my next build. For now, I'm chalking this issue up to "good enough for rock and roll".