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