sorry, that was cheeky. here you are then, warmoth parts, first search. cheers. 24 Fret Extension Each of these necks fit the standard Fender bass without any modifications. The fingerboard simply extends beyond the end of the neck, over the pickguard. available by special order. $25.00 extra cost.
The closest thing to a 24-fret P-bass I know of is Fender's Stuart Hamm "Urge II" Signature Bass with it's JPJ setup. I've never played one, but on paper it seems to work well in getting both Precision as well as Jazz tones (I believe the genesis was when Stu put a P in the middle of one of his older Kubicki basses to get a "thicker" tone when in the studio w/ Joe Satriani) but Precision "purists" say the body is so altered with the extended cutaway to reach the 24th and the shape changes that it no longer has the mass to get the proper tone and is no longer a "true" P-bass. Some people say that a Precision's very nature in it's tone and playing style precludes it from having more than 20 frets (like the P/DC American Deluxe with it's 22 frets). The Warmoth neck with the extended 24-frets is here, but don't bother: on a standard P-bass body they're virtually unplayable, and if you pivot using your thumb like Steve Bailey frets 21-24 are so close to the P pickups that they simply don't have the tonality of a P-bass.
trust me. i'm not a purest. the p-bass has a great tone, but even better than it's tone, is it's neck (imho) and that's all i need for this project. the warmoth will probably work since the body i'm looking at will easily be played that high.
Trust me my new friend,it'll be a long time before one is made,I've been advocating for one for years. Just look at my sig for proof.
I'm going to have to agree with the guys above. The overhang does not do you a damned bit of good and isn't even playable past the 21st fret. The proximity to the pickups is also a drawback with the fretboard, as it's going to sound thin, weak, and generally undesirable.