To the person who enquired about the rudder hole (sorry, I deleted the message)
On my 1989 M17 the center of the hole is:
24" below the top of the rudder
2 5/8" aft of the forward face,
and is 1 1/4" in diameter.
 
Hope this helps.
 
-Peter-
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Peter Jacobs, M17 "Enfin"
Victoria  BC Canada
 
                          'The gods do not deduct from man's allotted span those hours spent in sailing.'
                                                                    -- Anonymous