and enhanced with Bondapaste, a putty-like substance, to accentuate contours. The Bondaglass shell was then fitted with a solenoid, leather mouth parts and plastic eyes, as well as incisor teeth—a first for a Supermarionation production. Puppets known as "revamps", which had plastic heads, portrayed the supporting characters. These marionettes started their working lives with only a mouth and eyes; their faces were remoulded from one episode to the next. Particularly striking revamp moulds were retained and, as their numbers increased, photographed to compile an internal casting directory. Wigs were made of mohair or, in the case of the Penelope puppet, human hair. Puppet bodies were built in three sizes: "large male" (specifically for the Tracys and the Hood), "small male" and "small female". Sylvia Anderson, the head costume designer, devised the main characters' attire. To give the puppets increased mobility, the costume department generally avoided stiff synthetic materials, instead working with cotton, silk and wool. Between 1964 and 1966, the department's stock numbered more than 700 costumes. Each puppet's head was fitted with around ten thin tungsten steel wires. During the filming, dialogue was played into the studio using modified tape recorders that converted the feed into electronic pulses. Two of the wires relayed these pulses to the internal solenoid, completing the Supermarionation process. The wires, which were sprayed black to reduce their visibility, were made even less noticeable through the application of powder paint that matched the background colours of the set. Glanville explained the time-consuming nature of this process: "[The puppeteers] used to spend over half an hour on each shot getting rid of these wires, looking through the camera, puffing a bit more [paint] here, anti-flare there; and, I mean, it's very depressing when somebody will say to us, 'Of course the wires showed.'" Positioned on an overhead gantry with a hand-held cruciform, the puppeteers co-ordinated movements with the help of a viewfinder-powered CCTV feedback system. As filming progressed, the crew started to dispense with wires and instead manipulate the puppets from the studio floor using rods. Due to their low weight and the fact that they had only one control wire per leg, the puppets were unable to walk convincingly. Therefore, scenes involving movement were filmed from the waist up, with a puppeteer holding the legs below the level of the camera and using a "bobbing" action to simulate motion. Alternatively, dynamic shots were eliminated altogether: