I don't have a video but here is are some picture that might help. I have the smallest roller tool in my left hand pressing on the clay from the inside just a little above the tool on the outside. As you can see, I don't have the rollers well-positioned in this early picture. I was still experimenting with different approaches.
It will be a while before I can make a video since I'm five days out of my third surgery in the last four months. I am non-weight-bearing on my left foot for 10 weeks. .
I have also used the general model to create a centering tool. The roller is a Teflon rolling pin. I move it with a paddle that goes behind my left calf. Unlike the strong-arm, this leaves both of your hands free to shape the clay. you have so much power with this thing that you have to be careful that you don't shove the clay right off the bat. I can easily center 25 pounds of clay and probably much more but I haven't had the need. if you're throwing dry and thin you really don't need as much clay.
the picture is an older revision of the centering tool. The newest one has another small metal plate on top that allows me to anchor a long bar with a roller to the centering tool. the rolling pin is turning on the outside while the same time I have the ruler on the long bar pinching and lifting clay against it. This allows me to open the clay make a smooth bottom and then lift the clay up to the top edge of the roller. at that point I remove the centering tool from the wheel and proceed with the handlers as you can see in the first picture
You can see by the difference in the look of the hand roller in the first picture and the look of the rolling pin on the centering tool how well what clay sticks to Teflon. The clay build up here is an extreme case from when I first began to fiddle with this thing and was still expecting the clay not to stick to the wet Teflon.
It is quite handy also being a welder. Some times when I am pushing clay I think, gee wouldn't it be helpful to have a little gizmo likes so and such. I walk over to the welding some side of my studio, light up and 15 minutes later I come back with a new toy. I have stacks of these things. Sometimes I think I have more fun making these toys than actually using them.
Let me know if you have any questions.