You might try PM'ing henryk, a member here. He has designed and built several clocks of card that ran smoothly and quite well. He goes off on nature treks and can be gone for months at a time so you may not get an answer right away.
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This is a great hobby for the retiree - interesting, time-consuming, rewarding - and about as inexpensive a hobby as you can find.
Shamelessly stolen from a post by rockpaperscissor
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