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@pajamas
er.. at the risk of the guy at the EHCBP ch'ships being dangeruss himself and me looking a bit silly - I do seem to remember the guy with the ghost cog explaining to his rapt audience that it only works on a certain principle, namely that you have to have a certain chainring up front to create the right space to fit the (certain sized) ghost cog in to run effectively as a tensioner...am I along the right lines even though I'm not being very technical? or am I talking out my sorry arse?