What I can say is that the clues continue to support my view that I am on the right track and I will repeat that the best place for getting confirmatory information is the 'Toys' page - MT.138-139-140-141. The problem with this page is that unless you have already arrived at the right design, the page is almost meaningless. What the drawings on that page do, is help to refine the final design. That is what I'm engaged in when I can get the time.
Every drawing on that page supplies information, but they do not represent actual physical designs. As an example I can point out the slightly longer uprights on 'D' compared with 'C' - this is important information and without it would cause a problem which is only discernable if the right design is in front of you. Having said, that I worked out the solution to the problem when I saw it but it was good to have the confirmation that it was why Bessler had drawn the figures in that way and it was deliberate and not an incidental variation.
JC