I've got this kit that I used with the Harborfreight C-Clamp on a 560SL which has the same ball joints as the W124. Have not used to 10+ years, but as I remember it worked worked well.

http://www.sirtools.net/SPECIALTOOLS/tabid/124/galleryType/SlideShow/ItemID/73/AlbumID/28/Default.aspx

PM me if you are interested.

Cheers

__________________
as ever
Paul

1989 560SL
1987 300SDL
1987 300TD
1983 BMW 633CSi
1972 280SE 4.5