How do I Create angry bird pull system, elastic rubber?

I am trying to recreate this pulley , and cannot find a way to do this. i am beginner , sorry ,

I found this link whilst going through the FAQ which should answer your problem

EDIT: sorry i cant post links yet, but its in the top FAQ section, called angry birds.

you can post links using CODE

Plus this one

https://www.scirra.com/forum/viewtopic.php?t=64056&start=0[/code:1dcjbsv3]

excellent , thank you