An adjustable mounting assembly for mounting a neck to a body of a stringed instrument. The assembly comprises a first mounting to mount to the neck of the stringed instrument, a second mounting to mount to the body of the stringed instrument, and an adjuster mechanism interconnecting the first and second mountings and adapted to adjust and fix, in use, the relative position of the first and second mountings. The adjuster mechanism comprises a screw threaded member having a first threaded portion that is engaged in a corresponding threaded boss of the first mounting, and a second oppositely threaded portion that is engaged in a corresponding threaded boss of the second mounting.