Old 05-02-08, 04:53 PM
  #3  
Bill Kapaun
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Location: Mid Willamette Valley, Orygun
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Bikes: 87 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.

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Typically, the largest cogs are riveted or screwed together.
About 2 minutes per rivet head with a decent flat file and you can drive the pins out.

I did this recently on a 7 speed to make a custom cassette. IIRC, the 5 largest cogs were pinned together.
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