Plants4u,
Keep in mind that it is the nature of the beast that when the tooth on the outside is angled, there will be a space on the inside like shown in your photo.
I don't have a photo handy showing what it is like on my buckets. I would not be surprised if it was similar to the photo you posted. I will try to remember to take a look and even take a photo of what mine are like.
But I would not expect them to be too different from your photo. Only because a fit that is tight when not angled, will open on one side when angled...