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Hmmm, I tried that, but I'll give it another go. The cables feel a bit short but they definitely run through.
Balls. Fucking eBay.
beseku-
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.
Constable_Savage
Might be full of old oil that’s gunking up the ratchet mechanism.
There are more thorough ways to clean and re grease but you can try loosening it up by flushing with wd40 or something similar..
Might also be worth checking the cables run smoothly and that nothing else is restricting movement by being stiff / seized