Originally Posted by
8ight-e
Try a longer screw in those two upper mount holes as well as the chassis brace to help absorb some of the blow. This looks like repeated upside down landings and at speed pulling it, you can buy small angle brackets like those the guy made at lowes or home places usually.
Over tightening of the screws will also cause the case to crack and break over time. I suggest only using hand tools and no power tools to build or tighten things. This may help.
