The bridge is not flat.. it has a slight angle on it. There are small groves in the bridge where the strings go. And the zerks are pretty dead on to where the strings go, but dont have to be perfect as long as you have the groves in the bridge. If your zerks dont line up with your string spacing you can always loosen or tighten the zerk one way or another to get it to line up better. I like the zerks and will use them alot more in the future.
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how does it change the sound?
That is really cool! Outside the box.