Machine Design
When a belt drive is transmitting maximum power,

Effective tension is half of centrifugal tension
Driving tension on slack side is equal to centrifugal tension
Effective tension is equal to centrifugal tension
Driving tension on tight side is twice the centrifugal tension

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Machine Design
Turn buckle has

Left hand threads on both ends
Left hand threads on one end and right hand threads on other end
No threads
Right hand threads on bout ends

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