The Zero Glide Replacement Nut System borrows the "zero fret" concept to reduce string contact in the nut by up to 93%, increasing tuning stability, playability, and open string tone. It only takes a few minutes to install with absolutely no permanent alteration to your instrument. For Classical Guitar (Blank).
See the Classical Guitar DelCamp review of the Classical Zero Glide nut.
Also available in Black Delrin.
Just got a second one. Used the first on a Tele build. The multiple heights included give plenty of options. Takes some tweaking but so does a standard nut and you don't have to worry about overdoing anything.
I've owned guitars with zero frets and always wondered why the idea never really caught on...For me,It improves the feel,tuning stability and playability..I was interested when I saw this device and wondered if it was something I would be capable of installing without risk to my acoustic... it turned out to be easier than I'd hoped..with just a small amount of sanding I had it installed in less than an hour...I'll be ordering at least one more to try out on one of my electrics..thanks Bob M.
$39.99