Ohh, it's the ropes being rigid which does it, I see! I had thought the rope distance having to increase and decrease slightly as the prop moves up and down would have been an issue, but I guess not somehow. I have also found having simply two ropes at 90 degrees works well enough if one is trying to keep the constraint count to a minimum, as long as the intended suspension travel is short, as the prop will then move on a diagonal curved path. Regardless of the configuration, this use of ropes seems really shockingly effective to me.

They're just 4 very long ropes with rigid set to true. Each rope removes some freedom of movement and the 4 combined together only lets the entity move up and down (or whatever direction is perpendicular to the 4 ropes). You could probably make one using only 3 ropes.
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3534507531

I'll have to admit, in my over 37k+ hours in this game, I've never heard before of a "Rope Slider", or seen one.. Seems less unstable than a conventional slider, how does it work?

thank you so much for this mod... at long last!!!

Great addon, makes it easy and gives a quality result
Did not know about 4 rope sliders