Linear to rotary motion converter

Hi all
https://www.youtube.com/watch?v=HWxmxI_sq1Y
This is strange for me, how he can convert the linear to rotary motion without deadlock?
Have you any idea or a design?
Best regards
Hi all
https://www.youtube.com/watch?v=HWxmxI_sq1Y
This is strange for me, how he can convert the linear to rotary motion without deadlock?
Have you any idea or a design?
Best regards
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