Nancy Franks's marble machine80-year old Nancy Franks emailed me about the marble machine she built, also sent a video (https://www.youtube.com/watch?v=BFP4PYC0ojA) . Such a nice story!
I just want to thank you for those marvelously detailed and ingenious plans!
I feel I probably have the distinction of being the oldest woman to make one - I am 80 - and I may have it in me to make the Marble Machine 3 for my grandson when he is a little older.
Brian Sanders's version
of marble machine 2.1