Charles, I haven’t looked into this in a few years, but there was always just one type sleeve–brass male and steel female–so far as I know. I don’t even think it has a name brand but most trad archer places sell it, and Dave Doran’s Archery Past is my go-to choice for such. There are three sizes and two shapes, as I recall. I tried them all and found the oval unsatisfactory to the type handles I was building into my bows, and the large D sleeve too big. The small D works for most wood bows. Only problem I had with them, a consistent problem, was that the sleeve fit into the socket side too tight. On every one I had to sand the male brass insert down for a snug but not impossible fit. Beyond that I never had one fail … naturally, the wood will fail first. A glass sleeve of the same type would be lighter, and you could possibly make it yourself, but it wouldn’t be as strong unless it was really beefy. Excuse me if I’ve misinterpreted what you want … just trying to offer what I can until someone more knowledgeable shows up.
