Just for grins, I did a search on "Custom by Corky" and found two hits, this thread being one.
I can add little, but I have one as well. What I can tell you is that my father purchased it in Alaska in the 50's. He used to fly bush up there and did a fair bit of hunting. It was given to me in the late 70's along with a couple dozen fiberglass arrows, and blanks for another couple dozen. Over the years, I went through all the arrows either through loss or damage. Dad was very clear about never shooting a fiberglass arrow that had any visible damage at all, and maybe I took that to an extreme. Better safe than sorry. About 10 years ago I had a local archery 'guru' finish out the blanks. Not having an original, I told him that they should extend about 3" past the front of the bow at full draw.
He insisted this was wrong and they should be much closer. I deferred to his experience, and ended up with arrows that wobbled like a drunken fish. Did find a set of aluminum arrows at a yard sale cheap that seem to shoot pretty well, but demands of work and family mean I haven't shot in years. But the bow still looks and functions very well.
Not much really to go on there outside of my little story. But I suspect Corky might have been an Alaskan resident. Seeing so few hits on my Google search, I registered just to add this little tidbit.
Jon