I like Mike's idea for using Bondo. It is about the same density of the original steering wheel, has great adhesive characteristics on clean surfaces, and has some flex to it. The problem that I have had with J B weld is that it is extremely hard, making feathering it in with the steering wheel difficult and it cracked soon after a few musclebound turns of the wheel.
I'll be giving Bondo a go on the next one I do.
