Changing the front flex disk with the 300d dampener for the manual drive train was a PITA, the old bolts were allen which was pretty easy the new ones are 15mm but I only have 1 of half a dozen 15mm that will fit it.

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http://superturbodiesel.com/images/sig.04.10.jpg
1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42