You can also try a 2-3lb hammer on the end of a box wrench. Slip the box on the bolt (19mm) and keep pressure against it to keep it from coming off then smack the wrench. Use some PB type stuff as mentioned.

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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