No cud for foil.
Join Date: Sep 2005
Location: Baltimore, MD and Montreal, QC
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If you rummage enough, you'll be able to find a slide-in mount that will make a derailleur hanger appear where there once was none. It's how they mounted derailleurs on frames like that way back. Then you can just get a normal tensioner.
Or you could just get a bolt-on axle and turn it into a reggalar-ol' singlespeed. What's the situation where you need a tensioner even though you have semihorizontal dropouts?