I used a Totaly tubular TT-20+ from Erockets and a BT-20 nested, cut to 9.25 inches, which makes a perfect replacement for the Skywinder tube. I used the NCR Kuhn cutter to cut both tubes and used Tightbond III on about an inch of the the tube ends, then quickly slid the tubes together so they wouldn’t freeze, so only the ends are glued. I think this is ok since the gluing surfaces for the slide stop and fin can rotor hub are both internal, inside the BT-20. The outer tube provides strength and is the correct outer diameter for the vent slide/rotor release. You could repair a Skywinder with a BT-20 only, but the nosecone slide/vent assembly would be a bit loose and would probably kink the tube on landing.

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