A specialized at least bilayered device similiformic with the fretboardfingerboardkeyboard of an instrument is designed to be removingly disposed between the strings and fretboard or frets of the instrument and prevents or mitigates fret damages owing to string pressures\u2014such as during transport and storage of the instrument in a case or other. In various embodiments, the movable apparatus can include a leg structure and a wheel rotatably mounted with respect to the leg structure. pereirae, Eucalyptus globulus var. The actuator portion of the tiller may, for example, comprise an articulating end of the tiller’s arm or a throttle grip supported on the tiller.