I've had a couple of VonWeise movers apart and I don't remember seeing much of anything in them except rust on the screw. They use a plastic nut that looks like glass filled nylon which will work pretty good without lube but probably doesn't work too well with rust. Those movers don't even have a grease fitting on them so the only way to grease them is to take them apart, which is a PITA as you have to go back and reset limits and all that crap after you reassemble it.
The two that I redid with the brass nuts I made up got some really light grease that is very fluid and will flow inside the tube "some" and they got a bunch of it. I did put a hole in the lower part of the outter tube on the bottom side of one of them where I could pump some grease in but no faster than they turn I really don't think it needs any more in it.
About once a month I run the dish to both limits to help the nut pick up some of the grease that probably collects near the gearbox.
The SuperJack mover on my SAMI gets a few pumps once or twice a year as it does have a grease fitting for that. I also run that one full stroke monthly as well.
One of the things that probably get overlooked is the seal between the inner and outter tubes. I also put some grease on the outside of that inner tube so that the seal picks up some of it. That helps prevent it from rusting once the plating is off it and also lubes the seal to help it last longer. If that seal goes out or gets hard and starts leaking it will allow water to get inside that mover and that isn't good either. On one of mine I made a new seal out of a piece of radiator hose with a hose clamp on the end where the inner shaft goes in and out so I could adjust how much tension is applied to that to make it seal off. I check those about every three months or so.