On the way to half-moon flake the underside of the Schaublin SV52 milling machine table, I need to practice a lot on some sacrifical pieces before attempting to do this. I guess I also have to make another tip on the BIAX flaker as the one used in the video wouldn't go into the dovetail. As is also evident from the shot of the bump-flaking (lousy effort btw..), it is not practical to use in this case. Maybe some "push-methods" with a manual rounded flaker blader (I have seen elsewhere) can be used, but I am even less trained on this, so longer to the target..
BTW Might not have come out clearly.. You use the same practise as with "normal" scraping, ie. cross your cuts making rows at 90 degrees to one another.