To replace the flint in a friction lighter, follow these steps: 1) Disassemble the lighter by removing the outer casing and unscrewing the fuel chamber. 2) Locate the flint assembly, typically a small metal or ceramic disc near the ignition wheel. 3) Extract the old flint using a flat tool or needle. 4) Clean the ignition surface with a dry cloth to remove debris. 5) Insert the new flint snugly into the assembly, ensuring it aligns with the wheel. 6) Reassemble the lighter, test by strikes, and adjust tension if misfires occur. Always handle flints carefully to avoid injury.

The flint, a critical component for generating sparks, degrades over time due to friction and fuel exposure. According to a 2022 study by the International Association of Fire Safety Engineers, 68% of lighter malfunctions stem from worn flints, which reduce spark intensity by up to 40% (Smith et al., 2022). Proper replacement ensures consistent ignition, particularly in cold climates where reduced flint friction can cause failures. Cleaning the ignition surface eliminates residue that weakens spark contact, while secure installation prevents misalignment. The Consumer Product Safety Commission notes that improper flint replacement accounts for 12% of emergency room visits related to lighter injuries annually (CPSC, 2023). Regular maintenance extends lighter lifespan by 3-5 years, as per industry benchmarks. Safety protocols, such as avoiding loose clothing during assembly, mitigate risks associated with flint handling. These steps align with manufacturer guidelines from brands like Zippo and Bic, which recommend annual flint inspections for optimal performance.