A bathtub drain strainer or stopper often refuses to unscrew or come out due to decades of hard water calcium and lime mineral scale accumulation cementing the metal threads together, or corrosion binding the brass flange to the waste shoe. Furthermore, many older lift-and-turn or trip-lever mechanisms feature hidden set screws or complex linkage assemblies beneath the overflow plate that must be disconnected first. Verification: Inspect the inner barrel for hidden set screws and apply penetrating oil before attempting to unthread it.
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