Zert in the casting is the easiest way. Make sure you bushings are tight. If one is loose the grease will hydraulic through the loose side and may not pass through the other side. I always install new bushing and add 3 small file slices in them so the grease will pass though to the washers no problem. You can also put the zests on top (picture) using 90 degree fitting and grease them under the half shafts.
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