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London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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Di2_GP
So, I bought a bike for my brother to get into tri, and it came with a short cage 6870 RD. When we were setting up the bike, I put it on my direct drive trainer for him to ride as we adjust seatpost, stem..etc. Like the proper idiot I am. The trainer had a 32t cassette on, and I havent checked the limit screws either...soooo we managed to twist the RD behind the cassette. Great.
I found a job lot of broken/for parts 6870 RDs on ebay, 4 of them in total. Reached out to @Di2_GP who has been incredibly helpful with tips and tricks on how to disassemble these. I managed to swap the servo from my brother's twisted RD to one with a broken motor but functional body. Then started testing the rest of the job lot, turns out 3/4 has a working motor, and one of them was basically in a working condition after I cleaned its di2 port and gave it a rebuild. Love when these things get a second life!