Something I learned awhile ago, use a box wrench held firmly in place and smack the open end with a dead blow hammer. That will usally loosen a tight bolt/ nut. The same trick can be used to snug one down too. Don't forget to use WD-40 or PB Blaster.

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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