Irvin, thanks for the response. Did you see that the video shows pulling on the tighter string to equalize tension on the lower tension string? The crank is then re-tensioned on the same two strings and the tighter string is then pulled to again equalize tension. After two or three of these pulls, the two string tensions will be very close to equal. The tension will be equal when the two strings sound about the same when plucking them like a guitar. Then clamp and move on to the next two strings.
I know this process sounds a little goofy, but it really does work to equalize tension on the center mains. It is easy to prove or disprove by stringing all of the center mains the old way (pulling over the frame) and then using the guitar plucking step and using sound to determine how equal the tension might be. You will find that the strings pulled over the frame (throat end) will be lower tension (friction loss) than the strings pulled at the racquet top (straight out of the grommet hole).
Then string the center mains using the new method and see how equal the strings tension sounds. If done properly, tension will be much more equal due to no friction loss over the frame and less clamping steps (minimizes pull back tension loss.)
Stringing time is about the same due to less clamping steps and the racquet does not have to be turned from top to throat end and back again. Also, no more interference with the crank arm hitting the racquet handle.
The mains outside the throat area are pulled one string at a time since these strings do not pass over the racquet throat.
Thanks for listening. Hope some of you stringers try it.