McBear is right.
#1: it is not a good habit to keep anything more than is absolutely necessary on your key ring. I have only two keys - my W123 key and my W124 key on my car key ring. No key fob or anything else. I keep my other keys on a second key ring.
#2 if you start having any issues whatsoever with your tumbler, replace it.
Don't wait on this!


If that thing jams on you in position #2 you are going to be



and singing the blues.
It is a most


frustrating task to fix should it jam up in the wrong position.
__________________
Matt in Atlanta
1983 300CD
Black-on-black daily driver
270K and still chugging along
1992 400E
Smoke silver-on-mushroom
145K and counting on the M119