This very trivial task is to solder wires to the terminals of a small round 3.5 mm audio plug.
I can do this myself, but I need to show to others and this is one of the first times they're trying any kind of soldering.
The problem is the connector rolling away during the process of soldering. Students use one hand to hold the wire and another hand to hold the soldering iron. The plug itself lies on the table and rolls away after being touched.
Is there a standard, widely accepted way to do this kind of soldering easily? Do I need to provide some kind of vise for them, or there is some simpler approach?
The problem does not require soldering with one hand, using both hands is ok and preferred.