Just added another DIY video to my YouTube Channel on replacing the packing in the Morse type (white plastic type) found on may ski boats, and very common on American Skiers. This is my favorite packing because it is simple, and does not need big wrenches to tighten/loosen an jam nut. Simply pull the cotter pin and adj. by hand, replace the pin.
https://www.youtube.com/watch?v=GWOnddFSAj8