OMG! I just put in my shipped Barred Rock eggs. There was one that was a little long and I was afraid maybe it was a double yolker so I checked. Nope, but it did have a suspicious spot in it. I debated putting it in or not, and decided what the heck. Well I just went to check temps and the dang thing was so tall it cracked on top as it turned and hit the hardware inside
Luckily I got it out right away before it penetrated more than just the out shell. Will have to be careful what I put there in the center.