Changes

The other main opening is for the propeller shaft. Traditionally, ships have used a stuffing box to seal the opening around the shaft. This is literally a box stuffed with marine grease. Stuffing boxes always leak a bit into the bilge. They’re fitted with a grease nipple and, every so often, you stuff them up. More modern approaches exist in the form of seals. They tend to wear more on the shaft. A few can be replaced without removing the shaft.

[[Category:HullFittings]]