You guys need to get with the program, that's not the Rotj vader saber.
It was thought to be for a long time, but we've recently (within the last 6 months or so) discovered it is not. The hero ESB saber and the hero ROTJ saber are in fact THE same exact prop.
Regardless of what it is called, the saber talked about at the start of this thread has 7 grips right. I am sure I am wrong but all pics I have see of this saber has 7. Is the ESB like any other FX I have removed the grips from there are several holes drilled to hold each grip on. I am converting my FX Luke ANH to that "stunt" saber.