Children tend to be interested in what is inside their favorite toys. Often, after such a curiosity that remains is to throw away the “spare parts”. Meanwhile, the gear mechanism of the clockwork toys — a source of miniature milling cutters: fixed in the Chuck of a drill, they are well-treated, soft metals and plastics.
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Double Belomorkanal "Tandem" is my latest self-made design with a combo drive from pedals, driver and passenger (in this case, he becomes the second member of the crew), and two-stroke...
