Great video. That's the way to show the basics of anything. From there, we can launch, I think. You tell WHY you do something the way you do it, rather than just say, "Here's how you do it," without any rationale. Good job.
I would also like to tell you about an experiment I made, before I saw this video. I have a strip of heavy doe skin (leather). It's soft and stretchy, so I wrapped that just behind the glans to take advantage of the glans lip to help hold it on.
Around that, I wrapped a velcro strap (with the slotted hole end) that had a hole punched in the end of it. Into that hole I hooked a green bungee strap (about a foot long), and then I looped a similar but longer velcro strap around the instep of my foot, punched a few holes in the end of that strap for "adjustments" and found the place where there was always tension.
The effect was pretty cool, too. As you walk, you can feel you dick stretching. When you sit down, the tension ALMOST relaxes, but not quite. I wore this comfortably for a couple of hours, but had to remove it because of other business. I think it to be successful, however, in that it was comfortable and I did not strangulate my cock. Matter of fact, it felt very inviting.
Still, I cannot tell anybody where that doeskin comes from, so I'm no help. Just that here is another "principle" someone might profit from.