11:45 PM

Super Simplified

Check out the way SRAM makes their cassettes.  Single block of steel milled out to shape.  No bolts, screws, no fasteners at all. Nice and simple.
 
SRAM_OG-1090_progression
SRAM_OG-1090_cutaway
hero-larger-2011
 
http://www.sram.com/sram/road/products/sram-og-1090-cassette