[TD78]

The arm works like a human arm: with a shoulder and elbow joint and hand (the part that picks up the tetra). You can use your own arm to test it out. With your palm up and arm straight, "drive" into a tetra, fold your arm up at the elbow until your hand touches your shoulder. Then rotate your shoulder up so your hand is above your shoulder and "drive" to a goal. When you reach a goal, rotate your elbow down so your arm is straight, "drive" forward so the tetra is over the goal, and rotate the shoulder joint down so the tetra is neatly placed on top of the goal. Back out and fold the arm back up for easy driving. Hopefully from the picture you can see the parts and motion I was describing. Hope that helps.

-Tom