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               Originally Posted by 
              JonasA  
              Can anyone tell me how you're supposed to get that much rubber in to such a small hole?
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         Yes.
         
        
 I know it's a bit late, but the answer is quite simple.
         
        
 Tie a piece or strong cord around the rubber on the narrow part next to the 'cone' . Feed the cored through the hole, and the narrow part of the cone, make sure the rubber, and the hole are wet, (with water) pull the cord.