PB b'laster penetrating oil used in the video: [ Ссылка ]
Finish line green lube I used: [ Ссылка ]
Basic overview of reviving a Shimano rapid-fire shifter that won't function. The most common issue with non-functioning rapid-fire or STI shifters is the grease or lubricant originally used in the shifter dries out over time. This video shows how to diagnose and resolve the issue.
How to fix a shimano shifter that won't shift
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