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300px|thumb|right|Small turnbuckle,
A turnbuckle, stretching screw or bottlescrew is a device for adjusting the tension or length of ropes, cables, tie rods, and other tensioning systems. It normally consists of two threaded eye bolts, one screwed into each end of a small metal frame, one with a conventional right-hand thread and the other with a left-hand thread. The tension can be adjusted by rotating the frame, which causes both eye bolts to be screwed in or out simultaneously, without twisting the eye bolts or attached cables.
Gallery (2)
Connections
mechanical tension
Entity
film
Entity
theatre
Entity
rope
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tonne
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fence
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suspension bridge
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screw thread
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rigging
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wire rope
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guy-wire
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eye bolt
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Volkmann's contracture
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screw
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fly system
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buffers and chain coupler
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mechanical joint
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safety wire
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lashing
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tie rod
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