I'm not sure that "built-in" is correct at all - the posts are quite long so you'd have to have a mighty thick headstock to do that. I believe the Gotoh website mentions that it has been done, but I haven't seen it, and they certainly
don't say that is the intention.
I've used them on my travel mandolins because they're so small and light, so you can shrink the headstock size down quite a bit (if that's what you want).
They are not particularly easy to fit - you need a smaller hole at the rear than the front - and the body of the mechanism is barely any larger than the post diameter so the everything does need to be super-neat and precise.
Very nice and smooth though.
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