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Maybe a helicoil repair ->http://www.tartybikes.co.uk/workshop/tartybikes_pedal_thread_helicoiling/c34p11260.html
edit: okay probably not a good idea with carbon crank arms
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Hmmm. That might be an option. I wish I had the energy/knowledge to fix it myself. It isn't the first time it happens.
Edit: You should be able to remove the insert, clean it, reglue it and be happy. But there must be some kind of design flaw to this, as I have seen this on FSA cranks before. Give me CNC aluminum pls!
Almost finished rebuilding last night, then realised that pedal threading on ds crank arm has become loose. F***ing carbon. So I am now ordering 130 bcd narrow wide ring to fit my Rotor 3Ds instead. In the end this is probably better anyway, as I can then use Tiagra BBs, which is much cheaper than FSA Mega Evo bsa30 BBs, and for cyclocross especially that is probably a good thing. Feel lame to bin a 200gbp crankset though... FSA = Falder Snart Af (danish for: "Soon To Fall Off").
https://www.youtube.com/watch?v=j2wYOHI5Ck8