Eric, it’s hard to tell in your photo, but did you leave the final back ring run full length into the metal sleeve, or was it ended at the outside edge of the metal sleeve. I see Simk left a top ring over the final back ring to flush with his finished handle, not violating the actual bow back if that makes sense.
I’ve made 2 Osage takedowns with the metal sleeves, 1@44# and 1@48#, both 66” long, and so far have had no breakage issue. I left the top final back ring run into the full length of the metal sleeves, but really like the way Simk’s looks. I hope his holds up to the test of time, because I would sure like to give it a go.