Here are some photos of my latest project, a Swiss made MIKIPHONE POCKET PHONOGRAPH made in 1926. It measures about 4 1/2" across and unfolds into a turntable capable of playing a 10" 78 rpm record.

This is a work in progress, so as I complete more of the rebuild, I will add more pictures.
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Here is why the spring failed - rust and corrosion weakened it til it broke.
This same rust and corrosion is all along the spring.