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				 Bent tab washer between the nuts 
 
			
			Hi Tony
 Not sure of how yours was put together but below is a picture of type mine has,  the other version I've seen is a big castle nut with pin.
 
 The first photo shows the bent tab keeper, 2nd shows the nut and pin, 3rd and 4th show how close I came to loosing a wheel after a keeper failed.
 
 Cheers Phil
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