I was changing the battery in my son's pump (Ping) tonight and somehow managed to overtighten the cap. Now it won't come off. It just keeps turning in either direction. I don't see any cracks anywhere, so I guess that's good, but the cap looks like it's sitting uneven. I can see part of the O-ring in one spot. I'm sure this will make it not waterproof anymore. I don't think it's going to effect insulin delivery because it primed just fine, but I'm going to keep an eye on his blood sugar anyway. I need to call Animas to find out what to do about this.