[ronbryan]

I made a similar one once by folding a piece of thin brass sheet into a 'U' shape and drilling a large clearance hole one side and a smaller hole the other side sized for the self-tapping screw. I did not attempt to fabricate the 'teeth' on the original Spire clip, but I did run the screw through before fitting it to the set to avoid it twisting out of position during first assembly.

Ron