I’ve got one that I put on a mid 80s Fernandez PJ that I got for free from my dad’s childhood neighbor a few years ago and tricked out with all kinds of upgrades. I added the doublestop lever to it, and I have it go between D, E, and F# (I wrote a keyboard bass line a few years ago that’s really hard to play on bass unless you tune F#ADG), and I don’t have much to say except it works exceptionally well!