Since few fans are able to see their favorite movie stars at work on the set, we present these candid shots taken between scenes on the sound stages at RKO Radio Studios. Ever wonder, how they make a close-up of hands writing? here's how it's done in Dorothy McGuire's latest RKO Radio picture, "The Spiral Staircase", in which she plays a mute servant. Her director, Robert Siodmak, helps her put feeling into writing her lines with lessons in screen-penmanship. September 03, 1946.