I have an old Trek 950 mountain bike from 1989. It's in fair condition, the frame has some rust spots, the chain and tires are newer, but still pretty old and it shows its age. This morning, the left shifter broke (Shimano Mountain LX) -- the cap on the top of the shifter flew off (lost) and something broke inside. Now I have to hold it forward with quite a bit of tension to keep the derailleur in place. It's only rideable as long as my thumb holds the shifter in place. Should I take it to a shop for repair or move on and get a new bike? I doubt those components are made any more. I don't ride trails any more, just street cycling.
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