In the heyday of the W108s, 109s, 110s, and 113s, I changed out many of those joints and never used that tool. I think that tool was supposed to remove a stuck joint which I never ever experienced. You do need to remove the bolt in the end of the joint though. I wouldn't be as concerned about that tool as I would the other two special tools. You need the little cone tool that guides the diff into the hole in the trunk. More importantly you need the long tool to line up all the brass washers and rubbers to mate the swing axle. Be caefull to install the boot correctly. The word " OBEN" should be on top.

Peter

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