Get the right spring compresser and the whole job will go easier, well at least for the spring removal. Mycontrol arm was so corroded I spent an hour getting the old mount out and the arm cleaned up before installing the new mount. Having that bolt upside down is not good. Hell if we're going to use torches on these cars we might as well pop a bead from the welder on all these bolts and nuts so they won't ever come loose.
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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