Original sentence: A bolt-in neck doesn't need to have such a flange inside guitar body, and screws or bolts run parallel to the surface of guitar, entering the back of the heel.However, at least one aftermarket manufacturer offers a replacement for Fender neckplates and screws which uses captive nuts — embedded in the guitar body by means of an external self-tapping thread — and M4 bolts.Slick heel with hidden plate (such as depicted one) makes playing the top frets more comfortable and special neck joint techniques, such as the Ibanez AANJ, Music Man Silhouette and Stephen's Extended Cutaway mitigate this problem.The difference is that bolt-on neck involves constructing a protruding flange that fits inside a routed pocket in guitar body
Edited sentence: A bolt-on neck doesn't need to have such a flange inside guitar body, and screws or bolts run parallel to the surface of guitar, entering the back of the heel.However, at least one aftermarket manufacturer offers a replacement for Fender neckplates and screws which uses captive nuts - embedded in the guitar body by means of an external self-tapping thread - and M4 bolts.Slick heel with hidden plate (such as depicted one) makes playing the top frets more comfortable and special neck joint techniques, such as the Ibanez AANJ and Stephen's Extended Cutaway mitigate this problem.The Music Man Silhouette completely eliminates this problem as the neck and its heel are cut to match each other - the heel blends into the body rather than becoming a nuisance.The Warwick Thumb range has bolt-on models.The difference is that bolt-in neck involves constructing a protruding flange that fits inside a routed pocket in guitar body