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2. Turnbuckle - Wikipedia

   en.wikipedia.org/wiki/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.

3. Rigging (material handling) - Wikipedia

   en.wikipedia.org/wiki/Rigging_(material_handling)

   Rigging is the equipment such as wire rope, turnbuckles, clevis, jacks used with cranes and other lifting equipment [1] in material handling and structure relocation. Rigging systems commonly include shackles , master links and slings , and lifting bags in underwater lifting.

4. D-ring - Wikipedia

   en.wikipedia.org/wiki/D-ring

   D-rings are attached to the tops or bottoms of flats with a "drift line" and turnbuckle attached to adjust the "trim". A D-ring on an M16 or variant type rifle is used to increase the pressure on the extractor and reduce malfunctions. This D-ring is a rubber grommet shaped like a "D" and fits over the extractor spring adding tension to it.

5. Clevis fastener - Wikipedia

   en.wikipedia.org/wiki/Clevis_fastener

   The clevis is a U-shaped piece that has holes at the end of the prongs to accept the clevis pin. The clevis pin is similar to a bolt, but is either partially threaded or unthreaded with a cross-hole for a split pin.

6. Fly system - Wikipedia

   en.wikipedia.org/wiki/Fly_system

   Fly loft of the Theater Bielefeld in Germany. A fly system, or theatrical rigging system, is a system of ropes, pulleys, counterweights and related devices within a theater that enables a stage crew to fly (hoist) quickly, quietly and safely components such as curtains, lights, scenery, stage effects and, sometimes, people.

7. Boom (sailing) - Wikipedia

   en.wikipedia.org/wiki/Boom_(sailing)

   Various hardware is found attached to the boom. The hardware could include fairleads, blocks, block tracks, and cleats. For attachment, screws are used on wooden booms and screws or rivets on aluminium booms. If the foot of the sail is attached to the boom, there may be hoops from the foot of the sail, around the boom, or there may be a track ...