[12 piece bucket]

In the photos of 10-2-B you can see quite clearly a gap between the thumb and 1st finger. This is how you can have the left thumb aft and the wrist truely flat against the vertical plane your hinge action requires.... or at least closer to it....

I'll have a look at the book at the weak single action grip later on to answer as im not so familiar with the specific variation... how I wish I had Yoda's capacity for remembering everything...

You are doing a fabulous job in this thread Mathew. Enjoying your "holding court." These quotes seem to be very "detailed", but Mathew is pointing out the very PRECISE alignments that are critical to the operation of your Machine bustin' up Plane Lines.

Grip type has a HUGE impact on your release motion. Mathew what is your preferred grip type, release motion and "stock" hinge action?

Great posts!