I seem to have much in common with the breed of horse under discussion, as I am also very grey. (English spelling)
Be that as it may, the book to which I refer does appear misleading. I was smart enough to realise that the diagram was a mirror image, especially as it was written at the bottom of the page.
The problem arises because the diagram of the treble side has brackets which relate to the size of the keyboard, and the brackets for the 72 Bass do not correspond to the instrument. This has been confirmed by my accordion tutor (a professional musician), who has now rectified the problem.
As he was curious about this matter, I have allowed him to borrow the book for a while. A member of his trio is in some way related to Karen Tweed, so he will inform her of this mistake. As the book is not currently in my possession, I am unable to refer to it at the moment.
As previously stated, I started this thread in the hope that other inexperienced accordionists could avoid the frustration of attempting to follow a diagram which leads them astray. I am not in any way attempting to denigrate Karen Tweed's credibility, I am merely relating my own experience with her book.
I could have manfully struggled on in a vain attempt to get tunes right, but am fortunate to have a very experienced accordion player who could put me back on the right track. If he says it's wrong ..... it's wrong!
Stephen Hawkins.