Join Date: Feb 2004
Location: St Peters, Missouri
Bikes: Rans Rockst (Retro rocket) Rans Enduro Sport (Retro racket) Catrike 559, Merin Bear Valley (beater bike).
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Actually there's a bit more to it than that.
If you examine your cassette carefully you may find that it's held together with some small bolts or rivets that project out on the back side. The typical 4.5mm spacer will interfere with those. Remove the little bolts or grind off the rivet heads and, if necessary, install the cassette one cog at a time.