This time the plastic along rivet holes line was first melted with a solder and then removed. It was found if one slowly and carefully uses the thick side of the older point is does not scratch the alclad. The sharp end does leave scratch marks.
Minimal masking was required.
Al the holes were de-burred. In the norrow fold of the skin the de-burr tip was removed and de-burring was done by hand,
