Alright, when I put a caliper on the screws I have I get the following:
M2 Screw section: 1.9mm
M2 Head: 3.4mm
M3 Screw section: 2.9mm
M3 Head: 5.1mm
What I mean is that the distance from outer edge to hole seems to be just set on the middle of each padding value (height/width).
It's funny that you just posted this. I had been worried about the screw heads overhanging the plate and swill took some measurements of the screws. Not sure I thanked him for that, so
thanks!. I didn't realize at first that the center point of the mounting holes was simply located at height_padding/2. I was originally using 5mm of padding, so that puts the center of the mounting hole at 2.5mm from the edge of the plate. The radius of the M3 screw as measured above would have been 2.55mm. So there would have been overhang. Not sure why I just realized this today!
But I guess it is easier to just calculate a plate with the tool and add my own holes, which works very nice.
Can you mention how you would do this. I'm a real noob with CAD, and when I use DraftSight to try and edit one of the DXF files from the tool, the entire design is selected. i.e. I can't seem to just select one switch cutout or one mount hole and attempt to move/modify it.