Grover Perfect Guitar Extension Nut

Sometimes the simple ideas are the best. The ones that become obvious in retrospect.

This simple little device comes in a package that claims, "Won't put your guitar out of tune!". Obviously the string tension has to be slackened in order to fit the device without damage to the instrument. Altogether it takes about 2 minutes to fit or remove, including re-tuning.

Depending on the guitar, it rests on either the nut, fretboard, or headstock. If you have an outstandingly expensive or rare guitar, you might not be happy with this. It works for acoustic or electric guitars, but works better on acoustic, I find.

It benefits from nut lube when fitting, as the alloy exhibits friction against the strings which tend to bed in, and more so than any nut I've encountered before.

This is a poor solution if you intend to intersperse fret-fingered notes with slide: the action is so high that the effort is hardly worthwhile and the intonation is ridiculously far off.

Otherwise, this is a very simple idea that works very well for either bottleneck or lap steel.

Purchased this extension nut in order to convert a standard electric guitar for lap steel use. The nut is solidly made from cast metal and the string spacing is just about perfect for lap steel use. To get the best possible results I would recommend the use of heavy gauge strings and a good heavy tonebar, such as a Shubb or a Dunlop. It is definitely worth the extra money for the tonebar if you are intend to play lap steel regularly. It only takes a couple of minutes to remove the nut to convert the guitar back to standard use

Overall this is an excellent product, at a reasonable price, and I strongly recommend it.

I've ordered this extension nut for my strat-style guitar with 7.25" fretboard radius, but immediately noticed that this piece was obviously designed for Gibson-style guitars because of 12" radius on the bottom of it as well as slightly longer base for behind-the-nut area (probably with angled headstock in mind).
But when installed on my Gibson it does the job. No buzz, string action is noticeably higher and it allows you to play with a slide without any problems. Probably you'll have to get used to 1-st and 6-th strings being placed wider than an actual fretboard width, but still it's a good and cheap alternative to buying a new instrument.