I have a couple of drives that go waaaay back to the stainless steel sprocket era (if you remember that!?). Apart from replacing the drum shaft on one drive which had rounded ends to the one with bevelled ends (so that it would work in a clip'n'go hull) I have never taken either drive apart for maintenance. I use them a lot and exclusively in salt water, I always hose them off after use, but apart from that all they get is the occasional (maybe every third outing) spray with wd40 or similar and the only time they come apart to any degree is if a chain/cable assembly breaks and needs to be replaced (which hasn't happened for years)...
...so I wouldn't sweat it if I were you - just use them, wash any salt water off them and know how to fix them if they ever go wrong.
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