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dismantle the shifter as much as you can. My wife's 6800 shifters do this every 6 months or so. I take the hood fully off, then there's two panels you can remove with small screws and this makes the access much easier. Still a pain but it's doable. No idea what shifters you have though
https://www.youtube.com/watch?v=MWDuQRXiGO4
fredtc
@Brum
I stupidly said I'd adjust and fix my dad's bike. The gearing cable inside the the sti shifter has completely frayed and the cable head seems to have come off. A few of the cables are wound around the mechanism, the gear cable head is missing and the shifters won't actually shift anymore. Been trying to pull out all the cables, but they're tangled and wrapped around. looks to me as if the whole shifter needs taken apart and addressed. I'm tempted to take it to local bike shop as now I'm in the realms of speculation, new bar tape, re taping said bar tape.
Any advice other than getting a whole new shifter?