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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.
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.
Galvanized surface with visible spangle Galvanization ( also spelled galvanisation ) [ 1 ] is the process of applying a protective zinc coating to steel or iron , to prevent rusting . The most common method is hot-dip galvanizing , in which the parts are coated by submerging them in a bath of hot, molten zinc.
Chainplate on a Bavaria 35 Match without shrouds mounted.. A chainplate is a metal plate used to fasten a shroud or stay to the hull of a sailboat to support the mast that sails are attached to.
Smaller devices called "Boat lifts" are available that simply raise yachts, sailboats, or small watercraft above the water level at a dock for storage, for reduced maintenance cost and increased security. They can be operated by cables, by hydraulics, or by air flotation and some are "drive on" to segmented flexing supports.
An Aviation Machinist's Mate connecting tiedown chains to padeyes on the flight deck of the aircraft carrier USS Dwight D. Eisenhower. A padeye is a device often found on boats or ships that a line runs through or provides an attachment point.
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