Machine Design
Turn buckle has

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

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Machine Design
When the shaft rotates in anticlockwise direction at slow speed in a bearing, it will

Move towards right of the bearing making no metal to metal contact
Move towards right of the bearing making the metal to metal contact
Move towards left of the bearing making metal to metal contact
Have contact at the bottom most of the bearing

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