A few things help in this regard. Firstly, the iron is 1 1/2" wide and 3/16" (4.7 mm) thick so adds great mass, but more importantly, it is parallel. This means a more predictable experience even when striking with differing force. Secondly, the adjuster is actually morticed deep in the stock (the Norris is just screwed to the bed), this transfers the energy much more effectively.

Oliver Sparks 2015