I've had to modify the end of the neck to make this item fit (plus mark up and drill 6 holes) to accommodate the individual screws as they go down. The whole point about this item is to be able to install it with enough adjustment room to start low enough and then go lower. I can't see any way of using it therefore without doing the modifications above. This is ok for me (I do guitar set ups and put this on te neck of a guitar I'm building) but will be beyond the average player.
On top of that I'm looking for such a low action at the 1st fret (0.3mm typically) that it is almost impossible to install this in such a way as to ensure that height ends up half way on the screw setting (to allow for some up and some down). Right now I am just hoping I've installed it low enough - but I'm only going to find out when I finished the guitar body and installed the neck onto it. Still - I'm hopeful.
But the point here is that IF it doesn't work out for me then the above modification means an unusable neck (due to having to cut an extra step into the fingerboard surface to get this item low enough above the fretboard.
So I can't exactly recommend at this point and will come back and update - but despite all the above I'm happy to be trying it out as it *may* be an interesting solution to a MAJOR set up/intonation problem found on nearly all guitars :-)
UPDATE: I came back to the neck I'd installed this nut on a year later only to realise I'd put it in back to front. Duh. But even when I turned it round the right way I could see that when fitted it STILL wouldn't give me the low 1st fret action I require on my guitars. Since the low 1st fret action is one of the most important parts of my setups I couldn't see the point of installing something that gave me less control than before so I shelved it and reverted to a workable bone nut instead.
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