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  2. Lewis (lifting appliance) - Wikipedia

    en.wikipedia.org/wiki/Lewis_(lifting_appliance)

    The lewis is liable to slip out of the seating if some of the weight of the stone is subtracted from the appliance, such as when the stone bumps on the scaffolding on its way up to its final location. For this reason, a safety sling should always be used together with the lewis until the stone is reasonably close to its final position.

  3. Safety wire - Wikipedia

    en.wikipedia.org/wiki/Safety_wire

    A safety wire is used to ensure proper security for a fastener. The wire needed is long enough to reach from a fixed location to a hole in the removable fastener, such as a pin — a clevis fastener, sometimes a linchpin or hitch-pin through a clevis yoke for instance — and the wire pulled back upon itself, parallel to its other end, then twisted, a single end inserted through a fastener ...

  4. Positive locking device - Wikipedia

    en.wikipedia.org/wiki/Positive_locking_device

    A positive locking device is a device used in conjunction with a fastener in order to positively lock the fastener. This means that the fastener cannot work loose from vibrations. The following is a list of positive locking devices: [1] A split beam nut; A castellated nut and a split pin; A hex nut or cap screw and a tab washer

  5. Molly (fastener) - Wikipedia

    en.wikipedia.org/wiki/Molly_(fastener)

    For heavy objects, multiple molly bolts may be required. The name Molly was formerly trademarked [ 2 ] but is now often used in generic reference . Other names used for this same general type of fastener include hollow-wall anchor and hollow-door anchor , sometimes with design variations but always with the same design theme of expansion via ...

  6. Wordlock - Wikipedia

    en.wikipedia.org/wiki/Wordlock

    An example of a wordlock padlock. Wordlock is a brand of combination locks, made by Wordlock, Inc., that differs from traditional combination locks in that it has letters on its dials instead of numbers.

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  8. Officer's tool - Wikipedia

    en.wikipedia.org/wiki/Officer's_tool

    An officer’s tool (also known as an A-tool, rex tool, or lock puller) is a forcible entry device used by firefighters and other first responders. Officer’s tools are designed to completely remove cylindrical locks from doors without causing major structural damage, allowing for direct access to the internal locking mechanism.

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