editing descr_skeleton.txt

Now, I know descr_skeleton.txt is a difficult file to edit. There is apparently some special software out there for making new animations, etc.

But what if I just want to change the impact frame of an animation?

Can I just delete the idx files and have the game re-parse the descr_skeleton.txt or must something more be done?

I found two tutorials in the scriptorium, but they were both for making entirely new animations. I just want to edit an impact frame, which *shouldn't* require changing the animation in any way.

Thanks in advance for your help!