Originally Posted by
grumpus
Get a 9 speed cassette, throw away the top sprocket and use 8 speed spacers? You'd have to do something about the lack of serrations for the lock ring - Loctite red?
That's a possible option, although Loctite Red would make it a permanent installation. The casette lock ring isn't a load-bearing thread (unlike the old freewheel thread), and it's been my experience most people grossly overtighten them. If any Loctite is needed, blue should be more than enough, and purple/green would probably be sufficient.