I had the same concern, here is a pic of what I did. I have been the #@$#$ out of my truck with no problems with this setup.

What I did was take one of the left over chassis braces from my Savage X SS kit used it as a post. I attached it in the same slot that the little delrin post would attach. Then I took a piece of fiber board and cut out a piece that would fit between the side of the chassis and the motor. Drilled two holes to line up with the holes in the chassis brace and attached with 2 screws. It works perfectly. I've landed every way possible without the battery moving at all.

http://www.rc-monster.com/forum/atta...0&d=1202597692

http://www.rc-monster.com/forum/atta...1&d=1202597692