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@jeff80
well, I've got the simplex to shift properly over a 3 speed block, but I had to basically dismantle 2 and rebuild them from parts of each to get that, but I still can't get the tension arm to take up the slack when on the smallest 16 tooth sprocket. IF you stop pedalling the chain basically just flaps loose against the chainstay, even with a shorter than ideal chain. The tension arm just won't spring back to take up the slack at all. I really can not get on with this derailleur system at all.
Give me a sturmey archer any day of the week