[Weightshift]

But what about plane shifts - they are common and well-defined within TGM orthodoxy. The plane angle varies but they always keep the same staright plane line.

Isn't the constancy of the same straight plane line the key thing ?

I am keen to understand this properly so please if anyone else can help - I would be most grateful. The point about an "inflexible" inclined plane is OK for zero shift patterns but needs to be further defined for those that shift planes - surely?

It is the Inclined Plane during impact that we are most concerned about.