There is NO STANDARD in shaft manufacture, therefore an S in one group may well be an R in another and often the reverse is true. A fitting using an accurate monitor is a very good start toward a good fit. A certain pro with the initials TW will give no more than three swings with a new club he does not trust. The reason being a human will adjust his/her swing to match the club. I have done many fittings in my day and have seen this malady all too often. Does not matter the name on the door, the important name is on the business card. Read about a man named Tom Wishon to get the real skinny on being properly fit for golf clubs.