I have a set of 712MB's with S300 in them. I just bought a set X100 shafts to replace the S300's. When I pulled the heads I noticed the shaft plugs were different in every iron. I went on the TTemper website and saw that the S300 and X100 are the same weight shaft. My question is... Can I just put the old plugs in the new shafts (matching up the irons) and get the same weight?