Wait! Is this an internal gear rear hub? If so, report back, and the proceedure is completely different. Do not cut off the ends of such a cable.
If it is a normal derailleur, then cut away.
jim
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Cross Check Nexus7, IRO Mark V, Trek 620 Nexus7, Karate Monkey half fat, IRO Model 19 fixed, Amp Research B3, Surly 1x1 half fat fixed, and more...
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SB forever