Dear Bill,
I just saw your post and I want you to know we do have a fix for your problem. We discovered this locking mechanism was a weakness in our design and have worked long and hard to redesign it for a "bullet proof" solution. Just in the last few months we have perfected a retrofit for this area. We are always looking for ways to increase the reliability of the Challenger. Please contact us at 877-446-5887, or by email at challengerop@gmail.com and we can fix you right up! Thanks.