OK I just did a quick search "stuffing box grease" and to my surprise it came up with a long list of sites regarding rudder packing and maintenance, with mention of the grease (zerk) fitting. There is even a site specific to a Volvo system that utilizes a remote mounted grease pump. So as our Hawaiian friend pointed out this is a rather common approach.
I will definitely be looking into this as part of the fix for my persistent rudder leak.
Cheers
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overgill
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