I have a dozen eggs going into lockdown the day after tomorrow! Way in the beginning one of the eggs got stuck to some glue that was on the back of my hygrometer (it was new, missed the glue- UGH). Anyway, a piece of the shell on the air sac ended up coming off. So, what do I do? I throw it in the trash. Then I take it out to see if the inner membrane was still intact. Worth it? No, I throw it away again. Then I decide its totally worth it and put it back in the incubator. For those counting, I broke the shell and threw it away TWICE. That little miracle eggs is still going strong! I made a little duct tape band aid for it so it wouldn't loose too much moisture. Maybe I'll take a picture of the doctored egg and share and hopefully a chick pic if it actually hatches!!!
Good luck everyone!