"Thanks guys for all of the new info.. I feel that maybe I can do this my self and save my self some money. Does anyone have a link to this DIY repair? "
ICI:
http://w124-zone.com/downloads/MB%20CD/W124/w124CD2/Program/Chassis/46-8110.pdf
ALSO, reams of info about this subject in the "Advanced Search"
All you need for this repair are:
1.New Tumbler (Actually "Leaved" device) (Comes with one new key)
[Keyed to your other Keys by V.I.N. ,available from any MB "Stealership"]
2. Self made or purchased "Tool"
(Correct size Diameter wire,with ends [INBOARD FACING] cut at a 45
degree angle.)