MashieNiblick
Tour Winner
Interesting you should say this Snelly, I've recently been watching a lot of videos of Luke 'effortlessly smooth' Donald and it is doing wonders for my tempo.
Definately agree that having a picture in your head of an actual swing that you feel you are trying to emulate does help.
I have quite a fast tempo (but actually my club head speed is quite slow) so I tend to picture Tom Watson which helps me feel I can keep it brisk without it getting too fast or losing my rhythm. I do however love watching different swings whether it be the languid power of Freddy Couples, the wonderful control of Luke Donald, or the athletic power of Rory.
Like many sports there may be a theoretical "perfect action" (e.g fast bowling) but the greatest exponents have always had the ability to do it differently.