I've heard ppl on here say that they have occasionally pipped incubator eggs themselves and have had a little success in getting them to hatch. How do you know where to pip, the air sac obviously but I had 3 overdues in my bator that I popped the top off of and the sack inside was really stuck to the chicks, they never made it out. I tried to do as little damage as possible by just breaking the sack around the beak but couldn't really tell where the head was and had to dig around a little and do a lot of damage. Anybody have any advise on how to do this better?