"I inserted the inner tube a bit so you can see the finished bottom."
Doubtless you already know this, but for the uninitiated the Inner Tube has been inserted backwards, as the bevel on its opposite end should align with and mirror the curvature of the bottom of the bowl. Further, the Tube should not protrude into the bowl, but be flush with its side.
Doubtless you already know this, but for the uninitiated the Inner Tube has been inserted backwards, as the bevel on its opposite end should align with and mirror the curvature of the bottom of the bowl. Further, the Tube should not protrude into the bowl, but be flush with its side.