Most acoustic guitars on the second-hand market are the Adjustomatic brand, noted by the fact that the guitar comes apart in two pieces - the neck and the body, through the clever and simple use of a long screw that holds the neck to the body. A threaded bolt turns against a small piece of 90-degree angle iron to allow the musician to easily adjust the string action, that is, the closeness of the strings to the fretboard on the neck. The guitar can be disassembled, reassembled and string action set with the use of a simple screwdriver.
