Perform precision assembling or adjusting, within narrow tolerances, of timing devices, such as watches, clocks, or chronometers.

Adjust sizes or positioning of timepiece parts to achieve specified fit or function, using calipers, fixtures, and loupes. Assemble and install components of timepieces to complete mechanisms, using watchmakers' tools and loupes. Bend parts, such as hairsprings, pallets, barrel covers, and bridges, to correct deficiencies in truing or endshake, using tweezers. Clean and lubricate timepiece parts and assemblies, using solvents, buff sticks, and oil. Disassemble timepieces such as watches, clocks, and chronometers so that repairs can be made. Examine components of timepieces such as watches, clocks, or chronometers for defects, using loupes or microscopes. Mount hairsprings and balance wheel assemblies between jaws of truing calipers. Observe operation of timepiece parts and subassemblies to determine accuracy of movement, and to diagnose causes of defects. Replace specified parts to repair malfunctioning timepieces, using watchmakers' tools, loupes, and holding fixtures. Review blueprints, sketches, or work orders to gather information about tasks to be completed. Test operation and fit of timepiece parts and subassemblies, using electronic testing equipment, tweezers, watchmakers' tools, and loupes. Bend inner coils of springs away from or toward collets, using tweezers, in order to locate centers of collets in centers of springs, and to correct errors resulting from faulty colleting of coils. Change timing weights on balance wheels to correct deficient timing. Estimate spaces between collets and first inner coils in order to determine if spaces are within acceptable limits. Examine and adjust hairspring assemblies to ensure horizontal and circular alignment of hairsprings, using calipers, loupes, and watchmakers' tools. Tighten or replace loose jewels, using watchmakers' tools. Turn wheels of calipers and examine springs, using loupes, to determine if center coils appear as perfect circles.

Mechanical -- Knowledge of machines and tools, including their designs, uses, repair, and maintenance. Design -- Knowledge of design techniques, tools, and principles involved in production of precision technical plans, blueprints, drawings, and models. Engineering and Technology -- Knowledge of the practical application of engineering science and technology. This includes applying principles, techniques, procedures, and equipment to the design and production of various goods and services.

Repairing -- Repairing machines or systems using the needed tools. Equipment Selection -- Determining the kind of tools and equipment needed to do a job. Installation -- Installing equipment, machines, wiring, or programs to meet specifications. Quality Control Analysis -- Conducting tests and inspections of products, services, or processes to evaluate quality or performance. Technology Design -- Generating or adapting equipment and technology to serve user needs.

Finger Dexterity -- The ability to make precisely coordinated movements of the fingers of one or both hands to grasp, manipulate, or assemble very small objects. Near Vision -- The ability to see details at close range (within a few feet of the observer). Manual Dexterity -- The ability to quickly move your hand, your hand together with your arm, or your two hands to grasp, manipulate, or assemble objects. Arm-Hand Steadiness -- The ability to keep your hand and arm steady while moving your arm or while holding your arm and hand in one position. Visualization -- The ability to imagine how something will look after it is moved around or when its parts are moved or rearranged. Wrist-Finger Speed -- The ability to make fast, simple, repeated movements of the fingers, hands, and wrists.

Repairing and Maintaining Mechanical Equipment -- Servicing, repairing, adjusting, and testing machines, devices, moving parts, and equipment that operate primarily on the basis of mechanical (not electronic) principles. Getting Information -- Observing, receiving, and otherwise obtaining information from all relevant sources. Handling and Moving Objects -- Using hands and arms in handling, installing, positioning, and moving materials, and manipulating things. Inspecting Equipment, Structures, or Material -- Inspecting equipment, structures, or materials to identify the cause of errors or other problems or defects. Identifying Objects, Actions, and Events -- Identifying information by categorizing, estimating, recognizing differences or similarities, and detecting changes in circumstances or events. Monitor Processes, Materials, or Surroundings -- Monitoring and reviewing information from materials, events, or the environment, to detect or assess problems. Repairing and Maintaining Electronic Equipment -- Servicing, repairing, calibrating, regulating, fine-tuning, or testing machines, devices, and equipment that operate primarily on the basis of electrical or electronic (not mechanical) principles. Controlling Machines and Processes -- Using either control mechanisms or direct physical activity to operate machines or processes (not including computers or vehicles). Analyzing Data or Information -- Identifying the underlying principles, reasons, or facts of information by breaking down information or data into separate parts. Evaluating Information to Determine Compliance with Standards -- Using relevant information and individual judgment to determine whether events or processes comply with laws, regulations, or standards.