Okay, quick question for youse bike mechanics here. Earlier this year my mtb wasn't shifting down to smaller cogs on the back very well. LBS said cable was stuffed so they replaced it, it shifted down to smaller cogs again so I didn't worry. Anyway, only probably been on 5 rides on it since, the last one being my adventure race in the rain where the deraileur cage came apart and I lost the jockey wheels. So anyway put a used LX cage on then go for a ride and it wont go back down again. Pay attention to the cabling they did and it looks pretty rough. Still it's only a few months old so it shouldn't be the problem. The deraileur is like a 15 year old STX jobbie, so I was wondering if the spring in those things goes slack, and stops pulling like it used to?