A heavy molly EP grease is best. Like the stuff used in CV joints.
It sounds like the splines are worn.
Can you feel the slop when you move the to & frow ?
Some splines have a plastic coating & when that is gone you have a problem.
I have in the past done a McGyver repair (not on a KJ) by placing a few rows of centerpunch hits on each spline (all the way around) to widen the splines & remove the wear.
It works if done carefully.
Be careful if you try this & dont put the indentations too close the free end or you wont be able to get the spline back in.
You may need to use a plastic or rubber mallet to drive it right on.
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