I see you edited your post and added...
        
 
         
         
         
          Quote:
         
 
          
          
            
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               Originally Posted by 
              kinioo  
              Should I mention that it happened (I discovered it) when I wanted to use my bike after it had sat in the garage for a while???
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         ...which is a massive clue to what's probably gone wrong - seized bobbins!
         
        
 Go straight to option (f) from my list after watching the You Tube video above.