Some years ago, I ordered some for the Kodiak Magnum and the old static tip Bear I was shooting then. They were not made of rubber, but of foam of some type. You had to wrap the string above and below them with some kind of thin cordage (I used strands of an old string) to hold them in place. They worked well to keep the brush out, and were much lighter in weight and quieter than the dark brown hard rubber ones from the 60's. I quit using them when I switched to a longbow----I just picked up another recurve, and have been looking to buy more, but can't find the source, and I can't remember the brand name.
Anyone remember them? Have you seen them advertised recently?
I could probably make them easily if I could find some cylindrical foam of the same consistency----I looked at backer rod, but it doesn't seem dense enough.