A shower diverter knob or pin that feels stiff or hard to pull up is almost always caused by heavy hard water calcium and lime mineral scale accumulation encrusting the internal sliding stem and rubber O-rings. As mineral-rich water evaporates between uses, crust builds up and binds the moving parts together, restricting mechanical movement. Verification: Soak the diverter assembly in warm white vinegar to dissolve the crust and restore smooth operation.
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