I have redrawn the scorer sketch to show more detail.
I have used this tool successfully for over forty years now. I was
taught to cut the scored line to a depth when it was faintly visible
on the reverse side of the metal being scored, this was the perfect
depth for a clean crisp bend.
I have been told that the term silver steel is only used in the UK,
it is a term for a steel that can be hardened and tempered.
If you cannot obtain silver steel try using an old file.The tangs of
old files can be heated,bent and ground to make a scorer, grind it
roughly to the shape of my design, then re hardened and temper the
cutting point to a straw colour. I have made some scorer variants
this way, I vary the cutting point angles for different scoring
purposes such as a 60 degree point for hexagonal boxes, I see that
Richard Whitehouse mentioned this method of making a scorer from a
file tang on a previous orchid digest.
Regards James Miller