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This has worked on the left shifter. Left the right ‘to soak’ for a bit.
The thing I don’t get with the right one is nothing is happening with the cable...? Even without clicking, would it not tug on the cable at all?
beseku-
Not if the ratchetty bit is stuck "open" and not engaging at all. The grease hardens over time and accumulates contamination which gums it all up. Liberal WD40 works but you could speed things up pouring a hot (not boiling) kettle of water in the internals. Once something gives, repeat the above until it's smooth.
Constable_Savage
Wrap the shifters in a cloth, to catch the drops and stop them getting on your brake surfaces. With the WD40 red tube attached flood each shifter and leave it a while+/-. If you can use a bike stand all the better so you can rotate the pedals whilst changing the gears. Eventually something will give so spray again and repeat. They always give up in the end.