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@deleted
what is the necessary-ness of the "guides"? won't a 1/8" chain fit between them? seems a bit silly.
things have really rocketed in price, i have a non spring dmr one of these, only £20 a few years back http://www.sjscycles.co.uk/src/lfgss/product-Yess-Yess-ETR-B-Chain-Tensioner-19577.htm