But does using banjo tuners on your fiddle make it sound like a banjo?
The geared tuner has been around for quite a long time, and I've heard several people talk about adapting it to other instruments; but with this exception - so far as I know - it's been just "talk."
Nicely done to preserve the look of traditional friction tuners.
They'd really be a nice touch on a lap dulcimer if they can stand the slightly higher string tension range. And are they available for other fiddle-family instruments like viola, cello, etc.? I don't see any indication of anything other than violin at the web site, although I didn't poke deeply.