Tubing is much easier than syringing. It's exactly the same procedure putting the tube in as putting the syringe in. The esophagus is an always open chute directly into the crop. Just slide the tube along the right side of the throat as the photo shows in post #42. Then all you need to do is syringe the liquid into the tube. The crop can hold a half a cup, but don't put more than that in. Do it again when you see the crop has emptied.