The adjustment is really easy on the w126 300SD, not much in the way!!! You are going to have fun!! It is a 19mm wrench and a 6mm allen key as pointed out good luck.

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If it ain't broke take it apart and find out why.

1983 300SD, 4 speed
1994 C280
1987 300TD wagon
1996 HD Road King

Ride in Peace Eric Peterson, Harley of Macon