You may want to check out how I did rope and chain here. I don’t really remember how I did it, only that it took a lot of fiddling with the settings and that I don’t want to go through that again, but I ended up with a nice elastic rope and a more rigid chain behaving the way I wanted them.
The relevant code is in main/links and main/main.script in the start(self) function.
If you have any questions on my implementation, fire away. I’ll look into in any maybe remember why everything is the way it is.