Welcome to the new Wizard Outboard Forum.
reading about the gear grease here on the forum how is the grease inserted into the drive and how much is used . I see where the grease filler plug is ?
My WD-3 outboard has a brass screw plug in the gear cover that is for filling the gear case. Mine is frozen in place so I have to remove the cover and fill the gear case with grease as best I can and shove the cover back on.