Have a look at the pp2 (prop) attached above, and see if it is the sort of thing you want. There are three props in the pp2. Box_1, the top box is the base parent. ball_1 is smart smart-proped to box_1. box_2 is the end of the chain and is smart-proped to ball_1.

You can apply the morph in any prop and it will maintain contact with its neighbours. I put all the props in one pp2 for convenience of posting, but you can resave them as separate smart props and they should still work.

I had to give the attached file a ".TXT" file extension in order to be able to attach it. Save it as "3Props.pp2" to a props folder. That is to say loose the ".TXT" file extension. If you can't see the ".TXT" to loose it, open Windows Explorer, from the Tools menu, select Folder Options, from the view tab, un-tick (U.S. = un-check) "hide file extensions for known file types".

I've been up all night working on Antonia, and must go to bed now before I fall over. When I awake (if I awake) I will try to explain how it works, but in truth I'm not sure I fully understand myself. It's easier to do than it is to explain. In the mean time, see if it is the sort of thing you are looking for, and if so try to figure it out for yourself.