Just to be clear: the section is not a trade for unexpectedly balancing the light on the valve arm; rather, it is for an additional, separate capacity.
First capability: a static workpiece with adaptable lighting. Unsurprisingly, the light will grip the valve arm tightly while I move it from the stand to the job. Although I actually need to construct a stronger version of the sheet metal snare or replace the current one, I'll still use the gas saver as intended.
Second capability: a lightweight, portable workpiece. The light will rest in the stand when I'm using it as a foot-operated, hands-free light stand, which involves moving the work between the light and the blacksmith's iron.