Believe the Doc, this is one you don't want to do. If you really want to do it, find a used control arm and replace the whole thing.

The biggest problem is that you will need a special socket to remove and install the huge inner nut. Also you will need a special holding fixture or reasonable fact simile. There also can be some real technique needed to get the crush washer to crush even with the special tools. I have pulled the threads out of at least 4 nuts over the years trying to compress the crush washer. I currently smack (that is a special hammer term to pecisely describe the force level) the crush washer on one side to start the deformation.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician