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No idea if this would help for your situation, but I had a (older) Ultegra brifter that jammed while shifting to bigger cogs. The shifter felt mechanicaly blocked, so you couldn't 'flap' it to the left. I solved it by removing the shifter from the bar and tightening the allen key bolt on the back (where shifter meets bar) to remove a slight amount of play. Had the same problem on a R8000 Ultegra shifter, but that one lacked the allen key bolt on the back so no chance to adjust. Sent in for waranty at LBS...
Last night my bike wouldn't shift to the larger cogs on the rear derailleur. I pulled the shifter apart this morning and the pawl (circled green) won't engage the ratchet. It looks like the spring (circled yellow) has broken. Is it fixable, or do I need a new brifter?
Current brifter is Shimano RS 505, and I've had the bike since new for almost exactly 4 years. I know it's well out of warranty, but am a bit gutted if it's broken in a way I can't repair!
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