Here are the 2 texture files and how I changed them...
cutting_beam
![](http://www.sfc3.net/cutting_beam.jpg)
cutting_beam2
![](http://www.sfc3.net/cutting_beam2.jpg)
Here are a couple of ingame screenshots of them in action...
![](http://www.sfc3.net/cuttingbeam2.jpg)
![](http://www.sfc3.net/cuttingbeams.jpg)
cuppled with the right sound file, it works great.
but you can see how there are multiple instances of the beam in each texture file... 6 of them... so all you need to do is to narrow each instance... you just need to play with the files abit until you like what you see.