Old 08-11-13, 06:34 AM
  #2  
zacster
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Join Date: Jul 2004
Location: Brooklyn NY
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Bikes: Kuota Kredo/Chorus, Trek 7000 commuter, Trek 8000 MTB and a few others

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Two things. First, possibly your cassette is worn out as you suspect. A worn chain will cause a worn cassette. Second, your derailleur is mis-aligned. The first picture makes it look bent in, and this will cause all kinds of problems. There is a tool to check this, the Park DAG-2, but you don't necessarily want to buy it. Take the bike to a shop and have them do it for you. Once it is aligned everything else can be adjusted.
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