.......why can't I do this on mrs o's bike?!
I am trying to set up her rear gears. Have even replaced the cable (a job I find particularly loathsome). Set the indexing up in the stand, a bit rattly but largely ok. However as soon as she rides it, some of the low and most of the high gears jump in and out. My indexing admittedly consists of nervously twiddling the tension thing this way and that until it settles, but this one just won't. Rear mech and hanger seem fine.
Basic method anyone rather than just twiddling and hoping, please? I hate indexing!!!