Also, I have not yet started restoring the 2 Humpty Dumptys I have but I have taken them apart and tinkered with various parts. It does look very basic and many of the parts - coils and some of the plastic bumpers are still available. The Pinball Resource is the best site for these super old parts.
We can figure this out together.
Also, I always have to promote my website PinballPrices.com
Thanks and look forward to talking to you.