I managed to get one of these off ebay from the U.S. a while ago (for those that don't know, it's a device that straps to your right wrist and keeps it in a cupped position through the swing, stopping the undesirable swatting move)
It's improved my chipping accuracy a lot, but I simply don't understand it's use in the full swing - how can you release through impact with a cupped right wrist, surely everything should straighten out there should'nt it?