Well at the very least, it needs to be cleaned up. It is not in the best shape but I have seen worse. A wire wheel will be needed to really clean it up and Comet used to make a dray lubricant just for those pieces. Jumpy happens when the parts can't slide in and out easily. Also, that copper looking piece on your front part should be replaced. Ideally, replace the entire setup however that can be expensive so you can try option two which is clean..clean..and clean.
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