Extensor action is key- its flying wedge glue but in two minutes few would know how to do it correctly and screw up their swing because HK wanted a "stiff left arm." Be careful in dishing out small parts of the "elephant." Beside- what do they have to glue????
I think you are right. I have changed my mind! How about the grip...pressure points...and their relationship with the sweetspot? Everybody starts with the grip, right? Few however know what makes a good grip...good!
In Chapter 4 of the Tomasello videos Tom demonstrates the straight left arm in three minutes. He makes very good use of two props, the short club and the rope. Could you pare it to two minutes?