Making a wooden ball bearing on the lathe, patterned after regular steel ball bearings.
http://woodgears.ca/marbles/bearing.html
Using my homemade lathe:
http://woodgears.ca/lathe/
I was inspired to play around with making a wooden ball bearing after Peter Collin mae a "sit and spin" with a wood and marble ball bearing for our baby Harriet:
• Building a Sit-n-Spin