Sounds like the adapter broke...a common problem. The small ear that mounts to the head snaps off and the only good fix is to replace the adapter. There are two styles used, one has a slightly longer base (the part that mounts down in the head) than the other. You'll want the style with the longer base. I'm sure someone here will have a spare - I'm sure I do but since everything is packed for our move I have no idea where it is...
