I am selling my early aluminum wheel. The wood has sliver that came off at some point in time. I didn't "fill" the region b/c I thought it would take away from the look of the wheel to have some nasty filler in place rather than just leave it as it was. The wood is solid and the aluminum is not cracked anywhere.
I have an unrestored hockey puck button if you would like that too, but it's not as nice as the wheel. Send me a message if you'd like additional pictures.