Today was a day of firsts: first day to change shifting cables, first day to (almost correctly) adjust my derailleurs. Also, in case this is part of the problem, I put on a new chain/cassette combo. Overall I'm pretty happy with the result, but there's one issue I just can't figure out: rear derailleur cable tension (at least I think that's the issue). Either it's loose and I have poor indexing, but can shift to all the gears in my cassette or it's tight and I have wonderful shifting for 9 out of 10 sprockets, but can't shift to the innermost/largest one (even after playing with the L screw). Actually, I can 'shift' to my largest sprocket by pulling the cable by hand, I just can't shift into that gear using my shifter. I'm obviously missing something, I just don't know what ... any thoughts?