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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
MCamb
beseku
Anyone have experience with Shimano RX100 STI levers? I bought the missus a cheap bike on eBay and neither shifter clicks. The rear shifter doesn't seem to pull the cable at all. The front shifter pulls the cable but doesn't click or hold the tension in any way.
Any easy fix before I start the refund process on eBay?