Yes you have to cut a little on each side of the opening to get a wrench in there. Take a look at it with a trouble light so you can see. You don't need to cut much, a little at a time. Keep soaking with PB and use a big breaker bar to loosen the bolt and nut. Good luck.

__________________
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