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What’s next? Tear down?
I'd say so. Used to be a bit easier with the external cable ones, as long as the 2mm grub screw holding the lever on wasn't rusted in and you weren't fussed about cutting the Flight Deck wires. These days you're up for a re-tape...
My guess is that some grit must have worked its way between a couple of fairly large faces rotating against each other, probably have to be getting on the size of a coin to hold the lever up against its return spring.
Kimmo
@dbr
Right GRX 820 12 speed shifter is slow / sticky to return to centre after shifting up (whole lever swing left). I came down on that lever a while ago and filled it with mud but it seemed to get back to normal on its own, now it’s bad again.
I’ve tried to get all the dry mud out and sprayed in some silicone lube but it’s not helped much. Still need to return it manually.
What’s next? Tear down?