Hi,

I have a 1993 300e with m104 engine. Today, I was trying to replace the spark plugs. I was able to replace 1,3,and 5. 2,4,6 are under the coil packs.

I have been unable to unscrew the single screw that is holding down the coil packs. I tried a 1/8" flat driver and it was still too big. Is there a special size screwdriver that I need to get or where I can it from? As a last resort, should I drill out the flat head screw since it seems to be really screwed on tight?

Thanks,
BW