Homemade vernier caliper - 3D printing model.
A video about a homemade tuning unit for a radio receiver.
3D printing parts can be downloaded from this link:
https://disk.yandex.ru/d/xljp16bGWs7bSw
New archive with a pulley for a variable resistor and OpenScad source files plus photos:
https://disk.yandex.ru/d/bzh9twN_UJxyrw
Plastic tuning shaft (not tested)
Shaft diameter: 5.8 mm, locking washer: 6 mm.
https://disk.yandex.ru/d/VI4YQLQd-5atXA