can you post a few pics of the interior side of the grommet, After you used your DYI tool for the install?
Sorry, I don't have any pics of that. I fitted those grommets some years ago and obviously never took any pics. But, basically, what the tool does, is that it bends the end/inside part of the grommet so that it conforms to the slope of the screw head. There is actually a very good picture in my pdf of this at the very end. My grommets looked exactly like the grommet in that picture after having used the tool.
Please note that the pdf contains two variations of the tool. The second and last one is superior, and is the one I have used myself.
/Magnus