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Somewhere below the cockpit of every inboard sailboat, a rotating propeller shaft passes through a hole in the hull — and the stuffing box, packing gland, or shaft seal is the only thing standing between that hole and a flooded bilge.▶ 0:07 Traditional stuffing boxes use compressed rings of waxed flax or graphite-impregnated synthetic packing inside a bronze assembly with a packing nut and a lock nut.▶ 2:53 Contrary to common assumption, a slow drip under power is normal and necessary — the water lubricates and cools the packing.▶ 3:35 A box too loose floods the bilge; one too tight scores the propeller shaft.▶ 4:26 Correct adjustment targets both drip rate and temperature: warm is acceptable, too hot to touch signals over-compression or a damaged shaft surface.▶ 4:11 Repacking requires removing old material entirely, cutting new rings to size, and staggering the joints.▶ 5:09 The connected hose and clamps are part of hull integrity and demand the same scrutiny as the bronze fitting itself.▶ 6:36 Dripless mechanical face seals eliminate routine dripping but require bellows inspection, correct set-screw torque, and manufacturer-specific service intervals.▶ 8:11 Sail drives trade the stuffing box for a diaphragm seal around a larger hull opening, gear oil checks, lower-unit corrosion management, correct anode selection by water type, and paint compatibility on aluminum drive legs.▶ 10:18

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