I have included a picture of the balance shoe. The one on the left is the broken one. The one on the right looks like your 15-111 shoe. As you can see the broken one is 1&1/4 in by 1 &1/4 by 1/2. the spring mechanism clips into the broken one. I have tried to use the 15-111 in its place but there is no place to attach the clip.
Hope you can help
Fred
