EDIT:
This procedure is not MB approved, no safety or engineering data.
Use at your own risk.
By continuing to read this, you accept full responsibility for any attempt to use this theoretical unproven procedure.
Here's a few pictures of how I repaired the broken swaybar on my 300SD. Basically, I cut off the end, drilled and tapped it and inserted a bolt. But as usual, I digress:
1. As I looked at it shortly after it broke. The end bolt practically peeled out of the tiny amount of end material that wasn't corroded away.
2. Removed the shock and disconnected the control arm, swing it out of the way and holding it with a very carefully crafted piece of cardboard
3. Cut off what was left of the 16mm diameter end.
4. Started to drill a hole down the center of the swaybar end. I went slowly and carefully. No exotic drill was needed, but I kept checking squareness until I got it right. As you can see, the last picture here shows that the hole was still crooked. Get it straight before you get to tap drill diameter.