Here is the best tutorial on stuffing box repacking (if you haven't seen it already): Re-Packing A Traditional Stuffing Box Photo Gallery by Compass Marine at pbase.com
Check out his other 'how-to' articles as many are just as thorough.
The correct size might be 3/16", 1/4" or even 5/16". I doubt it is bigger then that but it depends mostly on the shaft diameter and stuffing box size.
For my 27' Tartan with a 1" shaft it was 1/4" that fit the most snug.
"The cure for anything is salt water~ sweat, tears, or the sea." ~Isak Denesen
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