Alan, I've seen some locksmiths do some pretty incredible (and nondamaging) things with MB. Would suggest you make a few phone calls to root out who is the best. My Benz dealer introduced me to a great locksmith that solved a different (security) problem for me. Just my 2cents worth. Good luck! Usually if you can meet them somehwere on another job they won't charge you to take a look.

J.R.
1980 450SEL
1986 280GE