Hi David. Yes that helps. Circuit board is also what I thought of, but wasn’t sure if/where it could be purchased.  
 
I opened up a spare starter tonight, and the insulators in the second one are a  slightly different material. These ones are shaped to wrap around behind the contacts. Seems like a better design. This spare starter was rebuilt at workshop 202 in 1979.
		 
		
		
		
			
		
		
		
		
		
		
			
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				1953 M37 CDN 
 1953 M38A1 CDN 
1967 M38A1 CDN2
			 
		
		
		
		
		
	
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