This style of red button was used on the shared stunt for the Luke /Vader from ANH. It wasn't a graflex but an aluminum tube with an angled cut to emulate the curved shroud of the graflex. With the addition of a glass eye, graflex clamp and grips, this was the saber Luke swings around in Obi-Wan's hut. This same Saber was used by Darth Vader in his duel with Obi-Wan only with the shroud painted flat black. So this red button has some serious screen time in fact.