Can you help us get our robot unstuck?

[Ben Wolsieffer]

We designed our robot to climb from one rung to another by attaching with an arm and then flipping over to attach with another arm. It works but only if we help it detach the lower arm after it flips. All the weight is on the lower arm and it can't let go of the rung to move on. This is a video of the robot climbing (but the human assistance in getting the arm detached isn't shown), http://www.youtube.com/watch?v=cgbJ7...ature=youtu.be. We can't figure out how to correct this problem. We thought of hinging the arm but that probably won't do it. Any ideas?