Algodoo

Here's prototype of pinball machine slingshot in algodoo.
Variables:
scene.my.dlN
Where N is the ID of Slingshot.
If you make 2 slingshots at same id both of them will fire at the same time if either one will detect collision.
Here I have made them independent: one slingshot is controlled by scene.my.dl1, second one is controlled by scene.my.dl2.