There are many methods for providing and effective All Day Stretch mechanism. This video covers one of the cheapest, most ...
Inverted V-Stretch Video
All V-stretches are designed to change the tension gradient within the tunicae, redistributing stress and thus providing greater stress at certain points in the tunicae and lesser stress at other points.
The Inverted V-stretch is a standard V-stretch with secondary stress added from the bottom of the shaft. As the stretch forces the angle that the penis leaves the body up it will effect the tunicae rather than the ligaments.