Need help in rope's logic

I am following an example of scirra.com/forum/a-rope-on-a-roller_topic49497_post311730.html

But I want something to be different:

• when I hit a key, the chain/rope will be extended by one object.
• (unimplemented yet) if I hit another certain key, this chain/rope will be shorten by one object.
• (unimplemented yet) I can create/destroy a new rope.
• (unimplemented yet) I can select which rope to extend/shorten.

However, I am fully aware that I do not understand how this works exactly, so here is my cap: mediafire.com

Right now, I am stuck in the first objective. Somehow, no object is extended from the initial object at all.

So like... how does a hinge in Construct work? And what kind of logic should I use for the 4 objectives above?

This logic will work:

http://dl.dropbox.com/u/5426011/examples12/chain_manip.cap

My "r0j0hound"-folder gettin' bigger and bigger :P

You never know for what they are good for later^^.

And here comes my macro: Thanks R0j0!

edit: what is the hastable for in the .cap?

Hashtable isn't used, I was going to use it to store the uid of the last link for each chain but I found just using the "for each" condition made it simpler.

Image: mediafire.com

I got one more question: how can we create more than one hinge object iteratively? The code in the image above does not work.

Like, from image above, if I press "right arrow", how can I create 5 Sprites with hinges connected together? How can we store UID or reference in the loop?

Here's my cap: mediafire.com