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2. Barrel threads - Wikipedia

   en.wikipedia.org/wiki/Barrel_threads

   Using action threads to mount a barrel to a receiver typically requires fitting by a competent gunsmith, and typically some machining has to be done. In this process it is important so set the correct headspace. [2] Correct mounting is important both for safety and accuracy. [3]

3. Set tool - Wikipedia

   en.wikipedia.org/wiki/Set_tool

   A Set tool is a blacksmithing tool meant to be struck by a hammer, either a sledge or power. [1] Set tools are usually made with a handle to keep the smith a safe distance from the action. Set tools for the anvil , where they are struck with a sledgehammer , often have a wooden handle set into the head in the same way as a hammer.

4. Gunsmith - Wikipedia

   en.wikipedia.org/wiki/Gunsmith

   The checkering tools are in effect tiny saws, designed to leave a v-shaped groove (of approximately 60 to 90 degrees) in the surface of the wooden gunstock. Special checkering tools consisting of two saw blades in parallel are used to set the spacing, usually between 16 and 24 lines per inch (1.0 mm to 1.6 mm line width).

5. List of screw drives - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_drives

   Pozidriv screws have a set of radial indentations (tick marks) set at 45° from the main cross recess on the head of the screw, which makes them visually distinct from Phillips screws. [ 11 ] While a Phillips screwdriver has slightly tapered flanks, a pointed tip, and rounded corners, a Pozidriv screwdriver has parallel flanks, a blunt tip, and ...

6. Robertson screw - Wikipedia

   en.wikipedia.org/wiki/Robertson_screw

   [3]: 85–86 They also allow the use of angled screwdrivers and trim-head screws. The socket-headed Robertson screws are self-centering and reduce cam out. They also stop a power tool when set, and can be more easily removed if painted over, or old and rusty. [3]: 85–86 In industry, they speed up production and reduce product damage.

7. Yankee screwdriver - Wikipedia

   en.wikipedia.org/wiki/Yankee_screwdriver

   The trade name "Yankee" screwdriver was first marketed by North Brothers Manufacturing Company in ≈16 April 1895, with the No. ≠130 spiral ratchet screwdriver. Yankee soon became and still is a well-known name in automatic spiral ratchet screwdrivers , with several other models, and model improvements patented by North Bros. over a 40-year ...