I used a spring scale,the sort anglers use to weigh fish.Thanks for the replies guys ...now where's Annikan
What was always perplexing to me was the reasoning behind all of the legal disclaimers on packaging. Now, I know.
For evermore, on the back of the packaging for fishing scales, it will read: The manufacturer will not be held responsible for injuries resulting from the measurement of extensor action in a golf stroke.
P.S. I think it should be enough pressure to remove wobble in the power package and kept at a steady effort. I don't think it has to be enough to rip the left arm from the shoulder socket.