ORIGINAL: SyCo_VeNoM
that piece looks easy enough to cut out of some aluminum
I had a RC that had a similar weakness(actually that piece just looks like a lot bigger version as mine was a 1/18th scale) I took the non broken one, traced it out on a piece of aluminum, cut one out fast, and it worked like a charm
I had a simillar thought.
I cant see any other weak points. The arms just doesnt flex so the thinnest point gives, which in this case is the pin holders.