Here's a fully reversible mod that literally came from a dream I had. The '51 Precision bass was always one of my favorite tones and since it didn't require any cutting on my Epi T-Bird Classic IV Pro, I had to give it a go. Absolutely love it. So now I'm the happy owner of a P-Bird! Turns out neck-thru mahogany works great with a SCPB pickup! Disclaimer: in order to get the standard SCPB pole pieces to line up perfectly with the strings, I did have to slightly trim the base of the pickup on opposite corners (about 1/8") just so I could get the right angle. But I honestly like the idea of having the poles a little closer toward the neck on the lighter gauge strings to fatten up the tone a bit there, relatively speaking. I realize the open bridge cavity, unplugged volume control hole, and showing pickup leads might bother some -- and I did think about making a cover and mounting ring, maybe installing a mini-toggle to select between two different tone caps -- but after taking a step back, I honestly dig it just the way it is.
Don't get me wrong, I've always been a fan of Thunderbird pickups with a nice set of heavy nickel roundwounds, but in my current band the SCPB pickup with flatwounds just fits the bill.
On a sidenote, as a result of this happy metamorphosis, the USA TB Plus pickups from this bass have made their way into the TB classifieds, just in case anybody is looking for a healthy set.
Anyway, hope you guys don't hate me for genetically engineering this bird! I swear it felt no pain
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