It's clearly the rear shifter...................... :skep:Shifters are very easy to replace. Is this the front or rear?
Basically, you shift to the outer cog on the rear (for standard action, for rapid rise it would be the opposite), or the inner ring if it's the front.
Then unbolt the cable from the derailleur, run the new cable through the housings, and pull it taught at the derailleur. Most time I've found you won't need to adjust anything unless the cable was really stretched or was out of adjustment to begin with.
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Great advice. Bike shops usually have a bin of parts just to scavenge from. Hopefully they'll have a barrel adjuster for you.I bet it is fixable. Shift into the smallest chainring. Clip just the cable crimp tip off, loosen the clamp bolt at the derailleur, take out the cable. One of the two broken pieces of the barrel adjuster will fall to the floor, keep it. Take one of the tiny (triangular) files from a file set, and use it as screwdriver by inserting the rough point into whats left of the barrel adjuster, and simply unscrewing it counterclockwise. Should back right out. Any good bikeshop will have a boneyard for the replacement. or straighten the broken one, and just have less adjustment out of it. GOod luck.