I've just changed the gear cables on my bike. I'm having difficulty with the indexing now. It is a 8 speed cassette. I can get it going 8-7-6-5-4-3-2, it refuses to go to the lowest gear. No amount of faffing with the barrel adjustor works. If I tighten / loosen it after a certain point then it goes to pot. It'll go 8-6-5-4-3-2 (so it'll jump past 7), 8-7-6-5-3-2 (so it'll jump past 4) or it will go 8-7-6-5-4-3 and refuse to go to 2 or 1. Any ideas? I don't know if my clipless moment really has damaged the rear mech (no visable damage), which is why I have wasted hours of my life on the effing gears again. If it makes any difference - I can't choose the 1 on my gears, the lever refuses to budge past 2 which made me think perhaps the cable was too taught, but I've loosened it loads to no avail. Please help it's driving me mad. I've read all the usual suspects (Haynes manual, Sheridan, Alex's bike tutorial etc).