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The carburetor may need to be adjusted to maintain an appropriate idle speed and air-fuel ratio, such as when moving to a higher/lower altitude or as the air filter clogs. Carburetors are adjusted either by the operator or, in some saws, automatically by an electronic control unit. [citation needed]
A fine adjustment screw is a screw with threads between 40 and 100 threads per inch (TPI); 0.5–0.2 mm pitch. An ultra-fine adjustment screw has 100–508 TPI (0.2–0.05 mm pitch). Even though these are non-standard threads, both ISO metric screw thread designations and UNC designations have been used to call out thread dimensions and fit .
A set screw is often headless and threaded along its entire length, so that it will sit entirely inside that hole; in which case it may be called a grub screw or blind screw. Once fully and firmly screwed into the first object, the projecting tip of the set screw presses hard against the second object, acting like a clamp .
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Ivan Kulibin (1735–1818), Russia – egg-shaped clock, candle searchlight, elevator using screw mechanisms, a self-rolling carriage featuring a flywheel, brake, gear box, and bearing, an early optical telegraph; Shen Kuo (1031–1095), China – improved gnomon, armillary sphere, clepsydra, and sighting tube
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