Yes, for pressing the big one in...

This is 2015 edition...

Of course there are threads about the HF one, and the Autozone tools. I think that SIR makes a good one...

But what about the eBay ones.

Here is one from Germany (China, I'm sure). Does it ship from Berlin to give legitimacy??

Mercedes Benz Master Ball Joint Press C Clamp Repair Remover Installer Tool | eBay

This one has a few more parts and is a "master" kit....

http://www.ebay.com/itm/Mercedes-Benz-Master-Ball-Joint-Press-C-Clamp-Repair-Remover-Installer-Tool-/311492805269

Anyone tried any of these or have a reason to think that they wouldn't work for installing the big ball joint into the knuckle on a w123?

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