I really like this thing, but I don't see why it has to be even this complex. Although since the servo is powered in both directions, the machine will work even

I really like this thing, but I don't see why it has to be even this complex. Although since the servo is powered in both directions, the machine will work even when upside down. A simpler alternative would have a STSP switch with a battery and motor. When you turn the switch on the motor raises the arm and switches itself off, a weight on the arm could lower it. Then again my version wouldn't work in zero gravity.