Thanks, lesbentley. I haven't heard anything from Scoopey, whose chain file is used, so I can't post this anywhere. Actually, it may be questionable for me to e-mail it at all. Hmm. Umm. Also, my test above works well, but may have been too simple. Upon trying a more complex test, in which the chain should move in three dimensions instead of just two, I find that the gravity prop becomes a bit unwieldy and results are less predictable. I am still testing and tweaking. If I don't hear back from Scoopey, I may convert the process to a simple figure of my own design. Then I can take you up on your generous offer for webspace. :) Thank you!

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Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.