Shrub wrote:Well yes the question should have been
'How do they get the brass around a keyway?'
In fact, I thought I asked that question, must have been my bad English and I was misunderstood. You know - "casting".
Anyway, I believe the story of rivets that hold the keyway (which is, as I now know, probably made of anti-brass - as in 'anti-matter'

I've seen that in KESO locks, those rivets are long and thin and should exorcize any screws someone could try to insert into the keyway. Wow. Those are advanced locks. And the keyway production process is probably much easier. Because it's nearly rectangular, not because of the rivets.
So - sorry for bothering some of you with stupid questions, and thanks a lot to the others for giving some good answers.
mh