There has been a lot of talk of steering wheels in the last few days. While on the topic, here's a stranger question: If someone were determined to MAKE a steering wheel, where would one go to get the inside-splined shaft that would be needed to hook up to the coupe's steering column? It seems to me that the easiest answer is that they should cannibalize an existing wheel that isn't a candidate for restoration, but maybe someone here knows a shortcut, like some kind of quick-release hub... Is there a more technical way to identify that spline pattern other than "course shaft from the E3, E9, E12...)?