Marine Wheel Hub Adapter

I purchased a Gussi steering wheel to be used on a Yamaha SX230, and the included wheel hub did not fit the boat shaft. The Yamaha appears to be a keyed shaft but has a pressed splined insert. I printed the attached part, and used 1/4 20 brass inserts Like these: http://www.globalindustrial.com/p/fasteners/Threaded-Inserts/press-inserts-thermo-plastics/1-4-20-reverse-slot-press-insert-brass-260-4-rs
To create a good bond between the new wheel and the hub addapter. I used longer #8 and #10 screw