The flexibility of club shafts is usually rated in four categories: A for whippy, R for regular, S for stiff and X for extra stiff. Or, as my company, MacGregor, does it: 3 for whippy, 2 for regular, 1 for stiff and X for extra stiff. When a golfer buys a new set of clubs he will be asked which rating he prefers. For the weekend player, greater whippiness will produce greater distance, but at the cost of accuracy. In general, if you are between 15 and 35 years old and break 90 you can function best with the S shaft, but each player must decide for himself what he needs and prefers. There is one way, however, for an especially demanding golfer to come up with an excellent combination of shafts. My former golf coach at Ohio State, Bob Kepler, is one who employs this ingenious system. He figures that his long irons must supply distance, his short irons accuracy. In his woods he uses a stiff shaft, but in his long irons (Nos. 2 and 3) he has a whippy A shaft. With this shaft he is able to get more distance and a higher trajectory on his shots. In his middle irons (Nos. 4 to 6) he uses an R shaft, and in his short irons, where accuracy is vital, he uses an S shaft. This is a very sound idea, though not many weekend golfers are going to be in a position to have clubs hand-tailored in this fashion. I myself employ yet another variation on Kepler's theme. I have had an X shaft taken from a driver, cut down and put in my pitching wedge.