Exterior door handle screw fell in door

[MeeLee]

What's the best way to fix the exterior door handle screws that fell out (the one behind a rubber grommet, on the side of the door)?

 

I was replacing the exterior door handle, however I unscrewed the screw too far, and now the screw fell inside the door.

Can I fix it, or does the whole door lock need to be removed?

What's the best procedure?

 

First, I need to find the screw, and tried fishing with a steel wire, without success.

[eisbaer]

i cant help on how to fix it but try using a magnet to fish the lose screw to a place you can get fingers onto it

[MeeLee]

The hole is about 1/4" (I don't think this will be possible). Besides, when using a magnet on a screw, laying in a metal enclosure, it's probably not going to do much (as the screw becomes a magnet to the door).