If you have horizontal drop outs, all you have to do is get rid of the ders and shorten the chain. Pick a gear that you like, I recommend you use the middle CR and then just cut the chain so it is tight on that gear combination. Not pretty, but it works.
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Il faut de l'audace, encore de l'audace, toujours de l'audace
1980 3Rensho-- 1975 Raleigh Sprite 3spd
1990s Raleigh M20 MTB--2007 Windsor Hour (track)
1988 Ducati 750 F1