Conundrum/suggestion

All the 30-note crank mechanisms for sale via the store link have plastic gears (and users complaining they break). Except ONE that has copper gears, but... it will not play what we compose/transcribe here, because it is not tuned c d g a b c d e f f# g g# a a# b c c# d d# e f f# g g# a a# b c d e... Identifying the right combo and adding a link to it would be a great help! Alternatively, could the "create" page allow to toggle between "c" and "f" options/tunings, as they seem to be called informally?