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I'm pretty proud of this. If you want to make a replica of a "Return of the Jedi" style Darth Vader lightsaber, you'll need one of these, and ordering this one from Shapeways is a lot easier than trying to make one yourself. ;-)
It's a fairly snug fit on a Graflex flashgun, so you may need to do a bit of filing to get it to fit over the raised part of the tube where the original test button was. This should also work well on a 1.5" sink-tube.
While you're at it, you might want to check out my D-ring holder for a "Return of the Jedi" style Darth Vader lightsaber. I plan to upload the other parts unique to that saber soon.