Hello Marc, and thanks for the clarity of your interjections! An explanation from the "horse's mouth", so to speak, is worth a hundred forum threads containing supposition and (unintentional) potential misleading to dummies like me!
Your level of contribution to the other manufacturers process is now perfectly clear, and the better news is that you are actually building your own models from scratch again. It certainly is a blessing to the melodeon world that you have a passion to strive for perfection, which includes the breaking of yet unforeseen bounds and barriers through innovation. I wish you the best of luck and every success in your future efforts.
(I often threaten to shut up, but find myself unable stick to it!)