The most frustrated I've been in years

About 15 years ago I started an origami model of a "Jackstone", using instructions in a book called "More Origami" by Robert Harbin. The book is so poorly illustrated that I never managed to get more than half way through the model because I simply couldn't get any further. And so it sat half built for around 10 years or so. Then a few years ago I somehow managed to get past that hurdle and actually managed to finish the thing. So last night I decided to give it another go. This time, with the aid of the internet, I've managed to get past the first hurdle, but still can't finish it. That is, I think I've gotten it right, and everything looks right, until it gets to one step where suddenly it's different from what I achieved in the previous step. I can see where things *should* go but can't see any way to get there. And of course noone else has ever bothered to put up some half decent instructions. The closest I have found was this site which had some tiny little jpgs showing just the first half of construction.

I ended up getting to bed far too late last night because I felt like I was so close to finishing that I should be able to do it in a few minutes. This was not to be. And I can't let it go now either. I'm not willing to concede defeat on something that should be obvious.