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Luthier to Convert a Long Scale Bass Into Medium Scale?

If you want to really convert it to 32" scale, just like what a factory custom would be, that will be fairly expensive. Probably in the range of $800-$1000 by most Luthiers. It means a new custom neck-thru style neck, matching the Warwick construction and dimensions. Then the original bass get sawn apart and the wings transferred to the new neck. A lot of fitting and matching the finish.

Can you recommend a luthier who'd want to do this? My favorite isn't interested.
 
You like it currently yes, but who's to say you will once you've done something that will change both the sound and feel completely. Not to discourage you, but it's something to think about. Sometimes you can't get everything you want out of one thing, and so that's why you own more than one. (Aka just get something built before a butcher job happens )
 
Can you recommend a luthier who'd want to do this? My favorite isn't interested.

Yeah, this is a bigger job than many Luthiers want to take on. Particularly the guys who are mainly in the repair business. You need a Luthier who does custom builds from scratch.

You can ask my buddy Keith Horne, whose shop is right across the hall from me. He's certainly capable of doing it; he's built quite a few 32" scale custom basses recently. He's pretty busy right now, so I don't know if he'll take the job. But you can certainly ask. Keith operates under the name of Marvin Guitars. His web site is: Invalid Link Removed
 
To change the scale of a thru or set neck instrument, you would have to remove the fretboard without wrecking the neck, and replace it with a new one. This is a difficult-to-impossible task. With an old instrument, you could steam it apart, but modern adhesives are much more resistant. Or sand it off. Either way, hard to imagine anyone would touch the job.

If you managed to do the first step without completely destroying the instrument, you would then have to move the bridge about 2 inches, assuming there is enough room. This would have the same effect as radically moving the pickups - it would change the tone of the instrument.

If your goal was to have your old guitar but with a new scale, it won't work. It might as well be a new guitar. And if it was a valuable instrument, it won't be any more. If you don't like it the way it is, sell it and get something else.

With a bolt-on, installing a conversion neck would also effectively move the pickups, but only slightly.
 
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I recently had my luthier convert an Ibanez miKro 28.5 inch bass into a 24 inch scale by using a Rondo Hadean 24 inch neck from one of their Hadean solid body bass ukes. Also changed the bridge and positioned it accordingly. Both are bolt on necks, and it came out great. Eric's Guitar in Van Nuys, California, [Invalid or Expired Link Removed].

Rondo Ibanez mini-miKro photo.jpg
 
Can someone recommend a luthier who would be able (and willing) to convert a Warwick Thumb NT4 from a 34-inch long scale to a 32-inch medium scale?

I've checked with Warwick and their dealers: a new, custom-made, medium scale, 32-inch Thumb NT4 costs way, way too much!
I honestly would recommend using a lower tuning with strings appropriate for that tuning and use a capo only if there’s a particular song you’re really struggling to adapt. I’ve used 4 strings setup bead to back up 5 string in the past . The only real issues I had with not having the g string was playing lines where I was droning on the open D and using the g at the same time. But those types of lines are very rare for me. The range difference isn’t that dramatic. Basically lose the 4 Highest frets from the g string and with thumb NT basses being 26 fret basses it’s even less of a big deal.
 
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Because no one else mentioned it, I’ll also add that you may want to think about the reach, not just the scale... when I first played Warwick basses I loved everything about them except how far away the nut was. But it’s not just the scale.

Any modification you make that moves your bridge closer to the neck is going to cut into the amount of reach you’re actually improving. IF that’s the thing you’re trying to fix.

Edited to add: I’ve played some 34” and 35” scales basses that—to me—hung like medium scales because of where the bridge was located on the body, the length of the upper horn/strap peg, or the full length of the body.
 
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