Systems, kits and methods are provided for mounting multiple tuning machines to a stringed musical instrument without requiring permanent alteration of the instrument. An exemplary mounting element includes a multiplicity of post apertures. Each post aperture is configured to receive a string post of a respective tuning machine, which is then axially secured within respective head stock holes of the instrument. The mounting element includes one or more alignment detents associated with the post apertures. The axial securement generally does not require penetration of the instrument independent of the head stock holes. When the string posts are received by their post apertures and are axially secured to the head stock of the instrument, the alignment detents restrict rotation of the tuner gear housing with respect to the instrument. The axial securement is preferably via threaded engagement between a threaded hub of the tuning machine and a respective barrel nut.