This is a great solution for people with small hands that have trouble reaching their right hand pinky F#.
What you usually see for fixing this problem are extensions to the whole key cluster. (Ab, Low F, F#)
Unfortunately, with that type of fix, the touch pieces have to travel further than before to do the job and
often, because the low F touch ends up much lower than normal, it is hard to slide the little finger smoothly
to the F#. With the pictured system shown above, all the keys stay in the same place and move exactly as far as before,
making moving the little finger from the low F to the F# very smooth and easy.
