thinking about doing the electric chair prop this year and would like to know from owners/builders of the prop what kind of pneumatic cylinder i should use....not build ur own or screen door cylinder, but something that holds up under use....but yet not big $$$'s......would like to know diameter and stroke i need to make the prop look real...i saw this prop at a halloween convention and it was goulish and disgusting.....just what i need for a new prop.....cold corpses and visions of death yet to come to all.....shadow of death