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I find that on my Les Paul P90 Burst the routing for the pickup cavities is quite tight and routed perpendicular to the body (rather than perpendicular to the strings).
The superior surface of the pickups are therefore not parallel to the strings - and it looks a little odd.
Cosmetically, I do wish they were (particularly the neck pickup), but in practical terms does it make a difference?
I ask because it will require significant routing to remedy what might well be a non-issue...