Linear tuners for elastic strings

It looks like most linear tuners have maybe a 2" range of motion, which is fine if you're using regular strings which only need to be stretch a couple of inches to bring in tune. However I'm looking to use Ubass strings which need to be stretched maybe 8-10" going from totally relaxed to tuned up. Are there any tuner systems designed to work with that besides the traditional post and worm gear? I'm having a hard time finding space for traditional tuners on this particular project.

I could imagine using linear tuners where you would pre stretch the strings and lock them in place, and then have the tuners do the last bit of fine tuning. The locking mechanism could be a set screw pressing against a plate that distribute the force over a length of the string. In my own experimenting I've found that just using a 1/4-20 plastic screw as a set screw, it digs in and mars the ubass string, so a plate or similar is needed. Or something else entirely.

Thanks for looking, and for any input,

- Dan

 

That's awesome! Do those tend to lock up, or as soon as the cable has some slack, the wedge loosens up?

 

The cams would assist with the rough tuning, and then fine tuners would do the rest? Not a bad idea

 

Planetary tuners might work as well, the only example I've seen of 'bass' planetary tuners are from VB custom, i.e.


Anyone know who makes those tuners?

Edit: Looks like they are Gotoh Ukulele tuners

Edit 2: Looks like they're Gotoh friction pegs. Gotoh friction peg, gold, black button, 4 pack

Edit 3: Nevermind, looks like they're Grover friction pegs https://www.amazon.com/Grover-2B-Ukulele-Peg-Jr/dp/B002HFQ88Y#customerReviews