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         ...great news buddy but get on this......My new sprocket arrived today too and it's a third design. It has the flange/shoulder and both sides are fitted with a hard rubber to match the sprocket's circumference. This is sometimes known as a 'run quiet', in theory damping out chain noise I suppose.
        
 The complete PITA was the tab washer wouldn't fit properly within this rubber ring. Out with the craft knife then !...
 
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        I have a lot of growing up to do. I realized that the other day inside my fort.
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