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@Technics100
cheers, yeah just been out tweaking it on the bike stand, so it does seem a bit better, pulled the cable more over the back of the mech as opposed to under it and it seemed to help.. although I think there is something funny with the shifter, this bit keeps coming loose, I have just replaced it too.. main lever support
http://www.sjscycles.co.uk/shimano-105-st-5700-main-lever-support-left-hand-6tj-5200-prod35234/