Piggyback piano Janko adaptor

thingiverse

A piggyback adapter transforms your upright piano into a four-row Janko piano with one octave included. Seven of these are necessary for a standard piano. The purpose is to offer consistent fingering across tonalities like a guitar and enable thumb underplay, cutting practice time by 50%. No drilling required; the adaptor fits on top of the regular keys and can be removed or secured with double-sided tape for stability. Optional painting of black keys in black is available.