For a couple of reasons, I was talking with an experienced salesman at the MB dealer where this car had been serviced. I brought up the tapping/rattling in the steering column and by my brief description, his first thought would be a steering assembly rack. If so, it would be about a $3,000 repair. Of course, that was an experienced salesman talking, not an experienced service technician.
1980 450SL @ 103,000 miles
1966 230SL @ Unknown Milage
2006 C230 @ 110,000 miles (Sold)
1994 E420 @ 118,000 miles (Sold)