This Flanging may be done in several ways.
"Laboratory Manual of Glass-Blowing"
Francis C. Frary
When Flanging a tube, it is held and rotated with the left hand as above described, while the right hand holds the Flanging tool.
"Laboratory Manual of Glass-Blowing"
Francis C. Frary
If the diameter of this tube should be much greater than that of the small tube, the latter may be enlarged with a carbon or a Flanging tool.
"Laboratory Manual of Glass-Blowing"
Francis C. Frary