Few things in life work as well as you hope they will, great expectations etc. The brass guitar nut trial was interesting though. I bought three kinds, an adjustable roller (bottom pic), an ordinary Tele type (top pic) and a fully adjustable weird screwy one (not pictured as I've not tried it yet). The Tele one (via Etsy) was fine, fixed in and fitted out of the pack and whilst not really making a noticeable difference it worked smoothly and it looks smart. Bingo.
The roller type, designed to replace Les Paul/SG nuts was more awkward. Removing the original nut was simple but this Guyker one (from China) was just a bit larger than the old nut so I'd to file out and straighten the pocket to get it to fit. Then once fitted I'd to reset the bridge, the truss rod, action and intonation because unfortunately a millimeter here and there makes a huge difference. The nut sits on a separate thin brass plate that I presume acts as a stable base. There's no advice how to fix this in so I decided against glue and hoped the fit was tight enough to hold (as the actress said to the bishop). In the end a minor swearfest but not a disaster.
The actual fine adjustment is a grub screw in the topside middle and two others below than you can only access by removing the nut. I didn't twig to that until I had actually seen the nut. Once it's on and stable there's no real reason to fiddle with it - not sure what advantage the extra grub screws really offer. It took a while to fit but again it looks good, like an obvious upgrade and feels a bit more solid. The rollers allow for more "tuning stability" or so it says, so we'll see how that all goes.
I seem to have gone my whole life agreeing with the "if it isn't broken don't fix it" advice and then completely ignoring it.

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