I, like many others it seems, have been having tuning problems with the G string on my SG, so I did a search to see what people have been doing to remedy it, apparently it's a problem suffered by a lot of Les Paul owners, or basically any Gibson like guitar with a angled head stock and three a side tuners.

It's caused by the break angle of the strings being too acute from the tuners to the nut on the D & G strings, and slightly less on the A & B strings, which causes the strings to get caught in the nut when releasing after a string bend.
A long known design fault that Fenders and other six in line tuners don't suffer.
Video below explains this problem well.
https://www.youtube.com/watch?v=gNpyCG32aGI


It can be fixed to some extent with very careful nut dressing and lubrication, but it always still exists to some extent, that's why I started searching for a cure.

Enter the String Butler, this is a small plate with 4 roller pins mounted on it, which once mounted on the guitars head stock, changes the string break angle between the nut and the tuners so it is a lot straighter, which stops the string catching in the nut after string bends.

It seems easy to fit, and can easily be removed.
Name: String Butler.jpg Views: 3921 Size: 5.9 KB
Below are some tech drawings of the two different types that fit different measuring guitar head stocks.
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And I suppose it wouldn't be complete without a YouTube video to show just how effective this like gizmo is in solving this tuning problem


And a second video follow up a few months later.
https://www.youtube.com/watch?v=xPpsAGdAHKE

Apparently the String Butler was a Kickstarter project and can now be bought from Reverb, at least.
https://reverb.com/au/brand/dietrich-parts

But that's not the real reason I've posted about it.
I reason that since this a DIY guitar forum, it's not unreasonable to think that this problem could be sorted in the construction stage, and without the String Butlers base plate that affixes under the tuners, by simply placing 4 such pinned roller directly on the headstock of a LP or SG built during construction.

I've given you the Tech drawing above that gives you the dimensions so you can work out where to place the pins.

I intend to do just this with both my two Gibson style guitar kit.