Hi Tom, 
I went through the same issues with my pumps. I am currently running with new single pulley pumps. However having heard of the Jeep pump idea I bought a pair of rebuild kits which are currently with my old pumps at a specialist who will be trying to make the conversion. I will update you when / if I get them back.
		 
		
		
		
		
		
		
			
				__________________ 
				Mike Gurr 
 
1944 Matchless G3L 
1944 No2 MK2* UC 
10 CWT GS trailer  
1944 BSA M20 
Royal Enfield RE125 'Flying Flea'
			 
		
		
		
		
		
	
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