You might be able to have an adapter milled at a machine shop, although it will probably be cost prohibitive and not very safe. To my knowledge, ship wheels of this type are generally ornamental and are not fabricated robust enough to be used for steering.
Hmmm, interesting thought. The thing is SOLID, and very heavy, but I understand your point. I know somebody nearby that could answer that question, maybe I'll run over and have him look at it this week. Thanks for that, hadn't even considered it...
S/V Christy Lee
Spencer 35 Hull 8