Learning Gravity, Basic Physics, and Camera Controls: An Angry Birds-like Game, Part I - Learn GameSalad for iOS: Game Development for iPhone, iPad, and HTML5 - page 160

Figure 6-3. Positioning the foot on the ground
Drag another instance of the actor on the scene. Replicate the previous shape
by holding the Option key and clicking and dragging the instance. Double-click
the instance of the actor and change the Rotation attribute to 330. Position the
instance at the top of the foot as per Figure 6-4.
Figure 6-4. Positioning the right frame of the slingshot