[jgannon]

This year's playing field is full of walls, and you will undoubtedly hit them multiple times... that's the nature of the game. If your arm broke after a single impact, then it wasn't yet robust enough for the competition. Testing and redesigning are big parts of the engineering design process. Be grateful that you've discovered this design flaw early, rather than at a critical point in the competition, and also be grateful that you'll have all day Thursday at your regional to reinforce your design and practice before it counts. You may be surprised at how rewarding this process is going to be. Best of luck!