Earlier today, the key in my 300D wouldn't turn. It does this sometimes.

After some jiggling it finally turned. I promptly removed the tumbler.

The key works fine in the removed tumbler. It doesn't hang up at all.

Does this point to a problem with the ignition switch/lock?

__________________
JWJ
1983 MB 300D - > 430,000 miles - Deep Blue - Bilstein Comforts - 0-60 in 24 seconds - 27MPG
1985 MB 300TD (wagon) - > 275,000 miles - Manila Beige - Thule rack - 0-60 in 18 seconds - 22 - 25MPG
Biodiesel, Mobil Delvac 1, and Viton fuel lines!