If you are as old as Smiffy, please consult your doctor before reading on.........
Does your follow through end up anywhere near this and if so, can you hold the position for any length of time?
Disclaimer........DO NOT ATTEMPT THIS if you have any flexibility issues
I know I hit a darn good drive when I feel the clubhead swinging round to the point where it is pulling forward again. Does not happen too often, though.
On a warm summers day, when I am playing really well it very happens every so often. Not enough though. Feels great when it does as you know everything has flowed correctly.