Best Answer: Hi, Leslie. Like you, I have found that some cartons of eggs are difficult to peel. I have read that extremely fresh eggs are difficult to peel after boiling, while eggs that are a few days old (but still considered fresh) are easier to peel. Other techniques I have found for easier peeling include plunging the hard-boiled eggs into ice-water immediately after boiling them, and then peeling them about 5 minutes later, keeping each egg a little wet while peeling. I find that trying to peel a refrigerated hard-boiled egg, can often be very difficult. This is why I now peel them shortly after cooking them. With all that said, let me now answer your question about the purpose of the Egg Piercer. The purpose of this device is to try to prevent your eggs from cracking while you are cooking them. The theory is that you should ideally provide a small hole in the end(s) of the egg, so that during boiling, the air which is at the end(s) of the egg can escape. Apparently the air heats up and expands during the boiling process and will crack the egg in order to escape. Sometimes you may not want cracks in the shells of your hard-boiled eggs, say at Easter-time when you are coloring your eggs and want them to look attractive.
I have used the Sur la Table Egg Piercer and find it to be the most attractive I have ever seen. It also works well. It has a safety feature to prevent you from accidentally sticking yourself with the piercing needle. Because of this safety feature, you need to twist the top slightly to unlock it and get it to work, and then you need to twist it again to retract the needle and make the device "safe." Be careful and experiment a little. Be careful not to punch your finger with the needle! Try putting an uncooked egg on top of the round part of the device, and then push the egg down gently until you hear the needle punch a hole in the egg.
I hope these tips are helpful to you. Remember, practice makes perfect. Good luck!