Just to show how top-obsessed I've become -- in no small part thanks to this forum:
Downsizing means lots of stuff to dispose of, and not much time to do it in. Really need ruthless snap judgments now, but I still struggle to let go of things that call to me as potential top parts. Like these leftover wooden buttons sold as bolt covers:
Visions of top rotors built up from these buttons dance in my head. Many possible 2D and 3D arrangements for finger tops alone. With LEGO stems, hubs, and tips added as needed.
Not sure how I'll pull off the precision gluing and drilling required, but I can figure that out when I rediscover these buttons in some moving box months from now. The geometry will be fun.