Hi all. Have been bogged down with bike problems ; o ( getting very demoralised. bottom bracket worn so replaced it, drive train still seemed to have resistance after changing it, but other than that everything was ok, so I took the cassette, jockey wheels and chain off, cleaned and replaced them. They are campag veloce 10 spd. I found the lower jockey wheel was in the wrong place, so reinstalled it in the correct position and with correct direction. Went to go out for a ride today and found gears needed adjustment, so set the tension and limits, but when going from large to small on rear cassette, gears are being skipped e.g, 1, 2, 3, 4 , 5 , 6 then straight to gear 10, or maybe 1, 2, 3, 4, skip to 7, then skip to 10. My bike is more off the road than on it at the moment!! What do you think the problem is now!???? Thanks