The current production version has a built up wing, with the wing joiner tube sockets going through 4 ribs in the wing, with plywood doublers on the outboard rib around the socket. In addition, the outboard end of the tube/rib is tied to the upper and lower spars in the wing. The wing tube length that goes into the wing has been increased from7.1" to 10.4", still 25mm diameter.