I've finally gotten and installed the ZeroGlide nut for my mandocaster. Full disclosure about this review: I am (hopefully) being compensated for this review, as seen behind the spoiler. That said, I'm going to give it a fair review.
► Show Spoiler
Dear Valued Zero Glide Customer,
My name is Wayne Rogers and I am the creator and patent holder of the Zero Glide Nut System.
I would like to personally thank you for using my product and I am sure you have noticed the great benefits it provides over a conventional nut. Actually, most people who have installed a Zero Glide on their instrument end up purchasing another for a second instrument or as a gift. This tells me that people love them as much as I do.
I believe that the Zero Glide Nut is the best $30 upgrade available for any stringed instrument and now that you have purchased and tried one I would like you to share your thoughts with the rest of the music world. So, I would like to give you a FREE Zero Glide for writing a honest review about this product. This idea comes from a review I found on the Delcamp Classical Guitar Forum which is a very up to date and reliable forum. Just send me the link to the review you have wrote about the Zero Glide on any guitar, banjo, mandolin, slide, luthier, or any other blog or forum. Also, send us your address and the model needed to fit your instrument and we will send you a Zero Glide absolutely FREE.
We are always looking for creative ways to expose this product so if anyone has any other ideas please feel free to call me or shoot me an email.
Sincerely,
Wayne Rogers
I ordered two mandolin nuts, one of each width. The wider one was the one I used for this. It came with the nut and 4 zero-frets of varying heights. All of these frets were guitar width, but were easily clipped with some wire cutters and made to not slice open my hand with the $10 set of files I ordered for this project. The nut part is a similar material to bone in terms of workability, but it was waaaaaaay too thick for the application. That said, the instructions do indicate that some prep will be needed to fit it to your instrument. For me, that required roughly 2 weeks on-and-off of filing during TV watching to get it to fit. I kinda lacked the regular tools for it at my apartment, so after filing it to fit, the zero-fret was too long, but made for easy clipping with a pair of wire cutters I had at my parent's house. Once the ends were clipped and filed, it was great. The zero-fret is much easier to navigate than a standard nut when first installing it, which is what I was doing here. I used the tallest zero-fret to make sure it cleared all the other frets, and it worked perfect. There's some buzzing on the neck due to it being fresh out of Cooterfinger's workshop and still settling in, but that's not a function of the nut. The zero-fret really makes things easier in terms of installation and creation, and, as discussed in this thread, the open chords sound as "full" as chords further up the neck.
Long story short: I'd recommend the ZeroGlide if you're willing to put a bit of work into tinkering with it. It's got all sorts of cool mojo arrows and from a set-up perspective really simplifies setting string height at the nut.