After talking to Brian at Ultra-RC he gave me the following steps which basically are the same as what ChuckW suggested.

1. Clamp down one end of the fuse at the table with the remainder hanging over the edge. I used my wife's dictionary.
2. Brian feels it's better to use an iron set at around 225-250ºF as opposed to the heat gun. The covering is a a very light Oracover (Ultrakote).
3. Twist the fuse in the opposite direction of the original warp. In my case I had a 1/4 in warp, so I twisted past neutral to about a 1/4in twist in the opposite direction.
4. Then using the iron at around 230º, I went over and reshrunk the covering where that was needed and loosen it in other places on both sides of the fuse. Then using a clean rag soaked in water, I quickly cooled the covering while holding the twist. This can be a little tricky.
5. Now, I would recheck the twist by placing the fuse on a flat surface.

Using this method, I was able to get almost all the warp out after a few rounds of the above steps. I now have about a 1mm "warp" which is as colse as I'm going to get.

So, now I'm hoping to try out this parkflyer this weekend. I'm almost done.

thanks,

tychoc