Based on this article, I made a tool that works pretty well. I took a pair of channel locking type pliers and I used some 5 minute plastic weld epoxy glue. I glued the quarter to the top jaw and the socket to the bottom jaw (do one at a time). Make sure they line up just about the thickness of the bushing. I used this on a 1980 300SD (after the hot soak) and it worked well. Just push the bushing partly in place and use the channel lock to snap it in. It seems to help to wrestle it around while you are doing this to get the lip of the bushing into the metal bracket hole.