190E 2.3 16V Ignition tumbler problem

[mnoll4060]

Hey guys,
I have a 16V, and the key will not turn anymore. I already have the new tumbler, but I can't get the key to turn to be able to remove the old tumbler (already did this in my 300E). What is the best way to get the key to turn? Are there any special tricks? I was thinkinking of grinding a screwdriver down to fit in the tumbler and breaking the tumbler so I could get the holes to line up so I could remove it? Would this work, or only screw things up more? Thanks in advance,

Mike