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			I don't know if this helps but I recently had to replace the transmission on my top.  Before I bolted the transmissions back in, I made sure to match up very precisely, the timing marks on the transmission.  After I installed them, the opening and closing was spot on.
		 
		
		
		
		
		
		
			
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				Current car 
 
2000 Boxster 2.7l  red/black 
 
Previous cars 
 
1973 Opel Manta 
1969(?) Fiat 850 Convertible 
1979 Lancia Beta Coupe 
1981 Alfa Romeo GTV 6 
1985 Alfa Romeo Graduate 
1985 Porsche 944 
1989 Porsche 944 
1981 Triumph TR7 
1989 (?) Alfa Romeo Milano 
1993 Saab 9000
			 
		
		
		
		
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