I made a small gizmo to transform the input image with two points that "look at" each other. This makes it much easier to attach stuff that has two anchor points or rotate and scale something around a fixed point. I got the idea when I was trying to rotate stock footage of a flare around the center of the screen. But why not use it for lightsabers? Or laser beams?
The possibilities are endless!!
Well. not really. but you know what I mean.
Get it from nukepedia here.