I tried to make this hollow form using Brother System 2 Deep Hollowing Tool from Hamlet Craft Tools. The object is 22 cm in diameter and 8 cm tall. I kept as small opening for turning as possible. This tool is a little bit bigger for this size of a form as well as Swan neck Stem would work better. However, it came out quite well, after all, and I look forward to being able to finish it after successful drying.