OK man.
I took my Ludwig 1/2" spur and traced it out 4 times.
Approximated a circle out of the pages.
If you made a circle with 4 spurs.
You get a diameter of approx 15 1/4".
So draw a 15 1/4" (diameter) circle on a piece of plywood and bend your bar stock to fit outside the circle.
The 1/2" spurs are approximately 12 3/4" long.
Butt end to tip of point.
Happy Bending......