I just purchased a used 2009 Trek Madone 4.7. The bike is great shape and is outfitted mostly with Ultegra components and Ultegra ST6600-G Flight Deck shifters. I've noticed that the left-hand crank shifter has a lot more play in it before engaging, maybe a centimeter or so, than the right-hand rear cassette shifter. Is this normal? How can I reduce the amount of play in the left-hand shifter so that I don't have to stretch to change chain rings?