I believe you need a tool like the one pictured in this thread:

http://www.peachparts.com/shopforum/showthread.php?t=149722

I found this on the 190e forum (www.190revolution.net) - and I know the subframe mounts are quite similar on the 201/124. I'm not sure how they look on the 210 though:

__________________
Daily Driver: 02 E430 4MATIC
In the family: '03 E500 // '04 ML500 // 64 220SE