> with your hands and nothing more than a single tool And doing 8kg a day for 50 years Another video, with an explanation of the "dimple": https://www.youtube

> with your hands and nothing more than a single tool And doing 8kg a day for 50 years Another video, with an explanation of the "dimple": https://www.youtube.com/watch?v=UZfc82ucaBQ https://www.youtube.com/watch?v=UZfc82ucaBQ