What problem are you trying to solve?

It's all the time falling off.

The arm? Did you fix the sloppy arm problem?

The last hole has a X in it and so it holds on to this. [The axle has groves in it.]

What are you using to move the arm? The gears have gone.

This works better. But it pulls off the motor sometimes.

Have you programmed it yet?

No, tomorrow... next day.

Next day.

What is this arm supposed to do?

It's supposed to go out like this and the, the end, it's...

Bump the container...

...bump it and tell the RCX to make the alarm. But when we turn it on the elastic jumps up and down and the arm doesn't move.

You've built it a lot taller. How come?

The push button (touch sensor) wouldn't touch the top because the sides got in the way so we builded it up and it pulls the elastic.

I'd like to show you how to make a strong tower...