Yes, M57 is probe start. 
I know I've typed in the list (of ANSI #'s and their meanings) a few times in the past.  Let me do a search .... OK here is one, there is a breakdown of the ANSI numbers in this thread (second post)
 http://www.canreef.com/vbulletin/sho...ight=ANSI+M137
HTH  
		
	
		
		
		
		
			
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				 -- Tony 
 My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills.  Whee! 
 
			 
		
		
		
		
	
		
		
	
	
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