Not sure that was the link you wanted.I agree roll-out nesting box so that the hen cannot get at the egg. Here is also a device, designed to stop pecking but said to be able to prevent them from breaking the shell.
https://www.backyardchickens.com/t/84592/need-a-rooster-whisperer#post_916192
They can be obtained from ebay (ebayUK) and may be a good thing to have on hand. I just noticed this evening that Lily's has broken off or popped off by her wiping it...have been wondering if I should leave on or remove. She goes to a new home on Sunday!
