I found the VESA adapter from Uhrensohn brilliant, but for my monitor, which I really wanted to attach near the wall, the adapter is pretty thick. Also I noticed that the original cutout for the panhead screw was not deep enogh to fit my screws.
Therefor I slimmed it down to only add 4 mm of height instead of 14 mm. Additionally I changed the cutout to fit countersunk screws with M4 diameter (ISO 10642).
You have to print it twice and mirror the second part along the x axis to get a fitting pair.