I have an 2010 secteur triple..las time I was out on it I was having trouble shifting up on the front chain rings...it got to a stage that the shifter itself was getting very stiff to move..I was knackered after the ride so it went straight into my garage..having read up here on what it could be..it sounds like the cable needs more tension..i'm out on a ride tonite..so need to get home and do this...the bike spec sheet says I have Shimano STI 2300 shifters..but the video tuturials with these one look different than what I have got....mine have the little levers on the inside of the horns which do opposite what the brake levers..the videos show another lever behind the brake lever...what I want to know is where do i adjust the cable tension?