in theory ithaka dosent leak. ive done about 8 builds and have had no issues. i did have to clean my ggts because of condensation build up and that did give a slight gurgle/leak, but after a quick run under hot water, no problems. i can see how not screwing down the basic feeding and rebuilbable enough will not sit the center post o ring far enough and that will create a leak. i hope you all get those issues figured out. be patient, i had many issues with ody and penny and they were due to user error, not to say you all are doing something wrong, but youll get it figured out and vape with a smile on your face.