Changing out cassette?

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Does anyone have a link to a good bike maintenance website? I want to switch out my cassette and would like a good instruction list w/ photos? I have checked out sheldonbrown.com, but it isnt very specific -unless i missed something..

thanks!

Here's a link to Barnett's Manual (http://www.d.umn.edu/~bjer0078/bike/manual/index.htm) - graciously put online as PDP files by the Deluth Bike Club.