I have seen that pitting before, specially on the cromed swivel balls up until 95 or so. the latter 96 to 98 1/2 discoveries series one, had a black swivel which so far has proven to be better than the crome units as a matter of fact if you get a new swivel ball from atlantic british you get the "updated version" the black one same with the dealer, you get "the superceeded" unit. it is not a matter of maintenance it is a matter of quality of build, the pre 90 or non abs swivels hardly ever show damage such as pitting
so I guess they had better build quality back then.
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