Explain the Retraction Mechanism of the SnapBack Guide

What happens here

The demonstrator explains the core functionality of the SnapBack guide. He highlights its internal magnetic mechanism and points out a visible red section on the tool. The innovative aspect is that as the screw is driven and its head approaches the surface, the outer sleeve of the guide automatically retracts once the red section makes contact with the material. This retraction instantly exposes the screw head, providing a direct visual cue to the user that the screw is flush and prevents any further over-driving. He manually manipulates the outer sleeve to clearly demonstrate this magnetic, self-retracting action.

Goal: Detail the operational mechanics of the SnapBack self-retracting screw guide.