Thanks Guys. I must say, I had some scary moments when making it. When I drew the picture, I actually had not figured out how to attach the bottom lug to the guard. At first I was planning to solder it, and that certainly is a possibility. But that would require a lot of serious risk, not to mention the clean up of a part that was already finished. So I decided to permanently attach the guard and prepare a hole in the ball to receive the lug. Of course that means it would be tricky fitting it that close and not relying on solder to fill cracks and for it to be solid.
I tried filing the fit but could not access the inside curves which were tiny to begin with. So yesterday morning at 2:30 an idea came to me. I went to the shop, yes at 2:30, and made a mock up of the ball on the end of a round rod and drilled the same hole in it and heated the lug and tapped the end to shape using the mock up to form fit it to the ball. That made the difference.
The picture shows the thin spacer backwards but it is switch correctly on the knife.
Here's another thing that was even a bigger danger. The butt cap had to be on the right cant, the right twist, and the lug had to be the right length for all of it to work. I left a little gap (the thickness of a business card) for the guards to absorb and spring it tight so there is no slack or movement. It is solid.