You might be able to use something like this:

FREE SHIPPING — Irwin Bolt-Grip Extractors/Expanders — 5-Pc. Set | Multi-Drive Specialty Sets| Northern Tool + Equipment

Not sure if this link will work but it is a tool made by Erwin for removing striped nuts.

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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