"One of my big driving keys isn't a swing position as much as it is a feeling--a feeling that my LEFT ARM IS BEING PULLED from its socket after impact. I think if I focused on forcing my left arm to straighten I'd be in trouble. It's more about the force of my swing pulling it straight, and me just being relaxed and letting it happen" (Camillo Villegas, Golf Magazine 3/08 ).
Is this a consequence of maintaining extensor action or does it have to do with the left shoulder climbing after impact? Other ideas?
I don't think he is alluding to extensor action but you might gain an insight into what Mr Villegas is saying by making a few flat out left arm only swings.
This "drill" is the panacea for many ills and should, imho, be undertaken regularly.