Join Date: Sep 2005
Location: Montpeculiar, VT
Bikes: Soma Rush, Fuji Cross, Raleigh Technium Mtn Bike, Ross 10 speed with Shimano 600.
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It might have just stretched the cable (more like pulled it through a bit) in which case all you'd need to do would be to put the shifter at the slackest setting, put the chain on the smallest cog, then loosen the cable nut, and pull the cable through taut. then make any minor adjustments with the little knurled tensioner on the derailer.
You may have also bent the derailer hanger tab inwards a bit in which case your bike will be reluctant to shift up to the largest cog. if that's the case, you'll need to bend that straight again. Some aluminum ones tend to snap, so go carefully. A large crescent wrench can do a good job. also many aluminum ones are replaceable, so if it's too badly bent, you can remove it, and replace it with a new one which will likely have to be ordered from a dealer of your brand of frame.