Adjustable neck-angle joint for stringed musical instrument

Adjustable neck-angle joint for stringed musical, instrument, which is constituted by two parts, the body and the neck, joined together with the use of screws. The number and the type of the screws vary, depending on the desirable tightness of the joint. It has the characteristic that a part of the joint's contact area on the side of the body is a convex cylindrical shape with an axis parallel to the body's width and that the part of the joint's contact area on the side of the neck is a similar concave cylindrical shape, with an axis also parallel to the width of body. These cylindrical shapes are in absolute contact, creating a convexo-concave joint. The instrument's body and neck rotate laterally in a predetermined manner, adjusting their relative angular position. There are channels, vertical to the instrument's width and parallel to the longitudinal axis. They are located either on the body's side of the joint or on neck's side of the joint. The mounting screws are sufficiently long to penetrate these channels, while they are constantly fixed in the other joint's part. While changing the neck-angle, the mounting screws make an angular movement within the channels.