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I'm using my digital camera on the range and have noticed that I tend to have a flip through impact. It seems as if the clubhead passes my hands either at impact or right after,

what causes this? any drills to stop?

thanks again all for helping me improve my golf game!

Hit balls by taking small swings with just your left hand (for right-hander) and concentrate on not letting the clubhead pass your hands at impact. At the same time hit down on the ball. This will help you get the correct impact feel. As you get a better feel for this lengthen your swing, as your swing gets longer your hands will naturally turn over. Without seeing your swing it sounds like you are trying to either force your hands over or trying to help the ball get up by hitting up into the ball. If this is the case, teach yourself to hit down and through the ball, it will produce amazing results. Specifically power and accuracy.
Good luck and I hope this is helpful.

one thing you need to do is keep constant grip pressure throughout the swing. If you tighten the grip at the top you will loose some angle. Try this to see my point, take a club and swing back to waist high with a VERY LOOSE grip. pause there and Now while in that position grip real tight and watch what happens to the club angle

Good drills for avoiding this on this article:
http://golf.about.com/od/golftips/l/blclubheadlag2.htm

It's helped me...