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I've honestly never had a problem with it on any guitar I've ever owned. I know the theory is good but equally you could argue the effect is the same on a string-through-body bridge or almost any trem unit, I'd almost go so far as to say it's just urban legend as far as tuning stability although it would have an impact of tuning accuracy I'm sure...
Nahguavkire-
I think that there are so many other factors and possible fixes that it's not a certainty that it will mess up the tuning. It just seems like one of those design optimisations that, all other things being equal, you should do.
it's just urban legend as far as tuning stability although it would have an impact of tuning accuracy I'm sure...
I'm not sure I get that distinction. They both rely on the string moving through the slot on the nut freely don't they. It's just that the former is from playing (especially bending) and the latter is from turning the machine heads.
ffm
Looks nice. It's slightly annoying that loads of good looking 3+3 headstock designs give terrible string alignment through the nut.