I cut large slots on the sides of the central point, and ran the nylon strap from the recovery system through that. It's not as neat looking, but I haven't had a problem with that in 8 flights so far, and it's a lot easier, and lighter to boot.
Pin the centering ring. Most adhesives do not stick to the plastic nosecones, longterm.
Use a 1/8" drill bit and drill three or four holes through the side of the nose cone and into the side of the ring/bulkhead. Next glue 1/8" dowels through the shoulder of the nosecone and into the side of the ring.