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2. Backplate and wing - Wikipedia

   en.wikipedia.org/wiki/Backplate_and_wing

   The backplate and wing combination is a modular form of scuba harness and back mounted buoyancy compensator used by scuba divers to support the diving cylinder and buoyancy compensator bladder on the diver's back. It also provides attachment points for accessory equipment such as auxiliary scuba sets for decompression or bailout, lights ...

3. Toggle bolt - Wikipedia

   en.wikipedia.org/wiki/Toggle_bolt

   Toggle bolts have wings that open inside a hollow wall, bracing against it to hold the fastener securely. [1] The wings, once fully opened, greatly expand the surface area making contact with the back of the hollow wall. This ultimately spreads out the weight of the secured item, increasing the weight that can be secured compared to a regular bolt.

4. Wingnut (hardware) - Wikipedia

   en.wikipedia.org/wiki/Wingnut_(hardware)

   A wingnut, wing nut or butterfly nut is a type of nut with two large metal "wings", one on each side, so it can be easily tightened and loosened by hand without tools. A similar fastener with a male thread is known as a wing screw [ 1 ] [ 2 ] or a wing bolt .

5. List of screw and bolt types - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_and_bolt_types

   They are usually made of low grade steel, have a slot or Phillips drive, and are used to join sheet metal parts using a hex or square nut. [12] plow bolt: plough bolt: A plow bolt is bolt similar to a carriage bolt, except the head is flat or concave, and the underside of the head is a cone designed to fit in a countersunk recess.

6. Sidemount diving - Wikipedia

   en.wikipedia.org/wiki/Sidemount_diving

   Sidemount diving offers some benefits in the flexibility of equipment. Cylinders suitable for sidemount diving are usually freely available for rental, unlike manifolded twin sets for back-mounted use, which allows the traveller to conduct technical or overhead environment dives without having to source twin cylinder sets.

7. Gudgeon - Wikipedia

   en.wikipedia.org/wiki/Gudgeon

   Gudgeons on the end of a shaft, A & B. A winged gudgeon is one that has extensions that increase its ability to adhere to the fixed surface. At the beginning of the Industrial Revolution, winged gudgeons were used to support water wheel shafts, [2] and later, steam engine shafts.