One of my chickens was sitting on a bunch of eggs and since they were staggered in hatching she lost interest in sitting on the rest after the first one hatched the other day. Yesterday I bought an incubator to try to hatch them myself. 3 have hatched, the last one did overnight and has a very large unabsorbed sac. I really don't feel that it's going to absorb and think that it needs to come off before it steps on it and rips it. I've had her separated and warm in a small box for most of the day and I think if I don't do something she's gonna die. What is the best method of clamping it off, string? I figure I'll clamp it and let it be for a couple hours before cutting it off. Thanks for any advice!