Details

My Shimano 105 Shifter (Left ST-5600) wasn’t shifting. It seemed to work fine when not connect. But when hooked up to the derailleur, it would shift to the large gear, but not back down to the small gear. I tried cleaning and lubing it, but it just wouldn’t work. So I decided to take it apart and see what was wrong and if I could fix it. But I found one of the pawls was broken. I think this is a common problem with these ST–5600 shifters, Anyway, this is the video of the disassembly.