I've found that getting the ball joints out is realativiy easy. Getting the new ones in has been the tricky part. I just take 'em to this shop where the guy has the right tool. Takes literally 5min. Not terribly expensive.

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Current fleet
2006 E320 CDI
1992 300D - 5speed manual swapped

former members
1984 300D "Blues Mobile"

1978 300CD "El Toro"