Here are the parts that hold the magnets in place. They are a brass eye bolt, an aluminum spacer, and a steel spring which is provided in the kit.
I made the eye bolt a couple of days ago. I made the threaded end first and cut off long enough to make the eye. I free handed a 1/4" ball using gravers and a t-rest, milled both sides, and drilled the center hole.
The pictures show how it goes together. The eye bolt secures the spacer at the top of the frame and the tops of the magnets bear against the spacer. The spring fits between the bottoms of the magnets.
For today's enjoyment I made 8 new bolts, 3-48 thread with 5/32 heads, from the 303 stainless that arrived in today's mail. I think it makes for a better appearance, and they only took 5 hours to make.
Eric