PRECAUTIONS TO BE TAKEN DURING WORK 21 - Stop the engine Pass thumb or forefinger across the throat. 22 - RETRACT THE TELESCOPIC ARM One forearm lifted forwards and clenched fingers: point the thumb in the direction of the movement to be carried out. 23 - EXTEND THE TELESCOPIC ARM One forearm lifted forwards and clenched fingers: point the thumb in the direction of the movement to be carried out. 43