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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