First RAISE Spring?

I saw this on Ebay - 
From the AMROCS 1970 catalog, a Launch Rod Positioning Spring.

I knew that Centuri had sold a positioning spring in the early 1970s but I can't find it in the catalogs now.
At a NARAM, the Centuri guys told me their spring was actually a model plane wheel retention spring from Carl Goldberg models. It fit their 1/8" launch rods perfectly.

Estes sold the same spring when both companies were owned by Damon. This illustration is from the 1974 catalog.

Back then I was very impressed by how well the support spring worked.
I developed my own version. The RAISE Spring was one of the first Odd'l Rockets products.