I can not find it.
If I am correct, it is an extra screw in a weak area, I think it is that buttonhead in the linked topic.
Maybe Overdriven knows it?
On the modelsport.co.uk forum there are some posts with Fatbears mods in it, but the pics do not work anymore.
You could PM some of the posters, maybe they have the pics?

Really sucks that his site is down!