Right-0 Charlie,
Hill's early quivers were quite soft, for the quietness sake, but many were too soft, and he had to attach a dowel to the outside to keep it from collapsing too much. In the 50's and later, he went to a slightly stiffer leather, probably about 6 oz. or so, which solved the problem. On his laced quivers, he just laced a stiff piece of sole leather to the bottom and that kept the bottom from collapsing too much. With the machine stitched quivers, HH Archery put a stiffer piece of leather around the bottom to keep the leather from collapsing.....Swinehart used this kind of quiver, and yours is probably the same kind.