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M_V
@fredtc
nah, seriously, they're not needed. Get some knurled nuts, such as these http://www.velodromeshop.net/index.php?p=catalog&parent=59&pg=1
or if you must chain tensioner, then the 10mm version of these will be fine
http://www.chainreactioncycles.com/gusset-chain-tensioner/rp-prod34985?utm_source=Google&utm_medium=Shopping&utm_name=UnitedKingdom&gs=1&gclid=CKv735O168ECFQMTwwodu1UAAA&gclsrc=aw.ds