Laminate Constriction

[Ronen Tat]

Reviving this thread to make a point regarding the action issue.
To my observation, the main difference between bolt-on and neck-through is the string-to-body distance. With BO's, there's a limitation on how deep the neck can be set into the neck pocket - unless you don't mind ending up with a 3" body. This limitation doesn't exist with NT basses.
However, while the fingerboard on NT's mounts flash on the body surface the bridge might be too high. This is compensated by creating an angle between the body and neck. Take a look down the fingerboard, headstock to body. Notice the body face surface in relation to the fingerboard surface (assume it's flat for that matter). Both my NT Ken Smith's have this angle taken into account which allows for great low action all the way - bridge to nut.

BTW, with many mass production bolt-on instruments, when you want to lower the strings, the saddles are already all the way down. The solution (poor but works) is shimming the neck - lifting its base from within the neck pocket, thus increasing the body/neck angle. This improves string/fingerboard distance and also has a little effect on string/body distance. Poor, because less contact between neck and body now.

Hope it makes sense.