Faucets gradually become stiff and hard to turn due to mineral scale (calcium and lime) accumulation inside the valve mechanism, the breakdown of factory lubrication on internal moving parts, or worn-out ceramic disc cartridges. Hard water minerals precipitate out of the water supply and form a abrasive crust that increases friction between the internal moving components. Verification: Disassemble the valve mechanism, clean all parts in white vinegar, apply fresh silicone grease, and test handle movement.
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