What a great site this is. Congratulations, I feel like a kid in a toy shop or an equipment junkie in a golf shop.
Although a few years back a very prominent GSED told me it was Rhythm, I have voted for Extensor Action.
The FLW is the basis of Rhythm and all Lag Loading and Hinge Action have Angled Hinging travel and Rhythm. Extensor Action promotes , among other things, the correct RATE of clubface closing.
The checklist mentions it so consistently that it has definitely the credentials to be IMPERATIVE. This is only my humble opinion.
Threaded Mode
