Hi Ron,
That is what I made of it, funny how a casual remark unveils something like this. I thought it odd on seeing the manual mentioning Scott. I will find the link that this came from, as there was a lot more about it, think it might have been from Scott enthusiasts in Australia! Will add it to this post, when I find it.
http://www.scotttechnicalities.com.au/technicalities/Chapter%207/7.3%20Three-Speed%20box.pdf
regards, Richard