#3
well, assuming you're not mounting the pickup flush, you could probably use a tune-o-matic bridge, which would allow for raising the strings enough to clear the pickup, and just make your neck pocket routing shallower.
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Shwiggity.
#4
Quote by atthedrive-thru
how do you not know that when it says you build guitars in your sig?

I've never had experience with soapbar p90s, I've used dog ear ones before but not these.