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Fatbiker-
Same difficulty as rebuilding the shifter - not massively difficult but a bit fiddly. If you like working on bikes and ride campag it’s worth the time learning.
You’ll need to source the ratchet from a pre 2015 (I think... one without the ‘A’ marking) 11 speed shifter for it to work with the 10 speed RD.
lmamammal
Rad, I was very tempted by this.
Do 11 speed record by putting an 11speed ratchet into the 10 speed shifter, then use all 10 speed ti parts minus crankset