I don't know how many of them he makes but they are superb quivers. About ten or twelve years ago Duane made me a custom 8-shaft Bandolero for a horseback hunt in the Yukon. The quiver rode on my hip/thigh for countless horse miles in the mountains and I never lost an arrow in that time. I was wearing it when I ground-stalked and killed a black bear, and followed that with my first bull a few days later.
I next used it on lion hunt in Utah. I carried it attached to my backpack and sometimes on my hip. It put up with all kinds of abuse from hounds, pickups, hard hiking and brush. Never one failure or lost arrow.
I don't use it every year, but when I know it's exactly the quiver I need and can rely on.