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         Jami
          
          OD of the baffle is 28.1mm.
          
          I use a lock nut on an extended 4mm bolt to try and hold this in although I hardly ever have it in. I've lost it a few times and each time managed to turn around an go and pick it up. Rather entertaining once on teh A10 coming out of London though!
          
          If you want a picture of the baffle then drop me a pm.
          
          Length of the 28.1 diameter is 24mm then it steps down to 28mm OD for 80mm.
          
          Cheers 
         
        
        
       
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