300E, Replacing Ignition Tumbler HELP!!

[Evan]

Recently my 1991 300E's ignition started getting caught up , so i got a new tumbler.. I even bought the wire tool to replace the tumbler.. when i go to turn the ignition half way on so the holes align i put the wire tool in and push,, however when i try and pull the tumbler out it wont come out.... there is a black metal cover over the old tumbler,, does this need to come out first? if so how do i take it out?? I have the whole bottom half of that side of the dash dropped so i could get a better view and it seems sealed.... ANY IDEAS ARE HELPFUL... as of right now my car is in pieces,, I need my car... thanks everyone!!!