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               Originally Posted by 
              DickyC  
              simple pop two fingers between the chain and the swing arm at the swing arms fattest point. 
                See Below
               
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         The manual specifies 50mm, so your two finger 'rule of thumb' is a great simple way of checking this. In my case it's a little more than two fingers (yes, it's 8:23 on a sunday moring and I measured my fingers!)