I have the 190d on ramps (butt up!) and i have the special tool (big socket welded to a 17mm nut). there isn't much room under there to work and the strainer is pretty tight.
Everytime it attempt to loosen it, the socket pops out (probably due to the angle of the 17mm wrench).
It is located pretty close to the drive axle boot and i certainly don't want to run the boot with and hare-brained attempts to He-Man it.

Do you have any tips on how to remove the strainer using the tool. or making the tool stay put?

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Ben
1987 190d 2.5Turbo