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Its not quite as straightforward as Alex would have us believe. Because the
towball assembly is not sealed, as in a wheel bearing, the weight on the ball
very quickly squeezes the grease out from between the top of the ball and the top of the inside of the cup, and down the curvature of the ball where it serves little purpose. You'd have to stop and reposition some grease to the top of the ball every few minutes to keep it lubricated.
If Leon replaces his towball every 12 months, greasing it becomes pointless,
as a towball will last many years without lubrication. My towball is almost
thirteen yrs old, still fully serviceable, and has never seen a skerrick of grease.
raymo
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