What does the term Edging mean? Saw it mentioned as Jelq/Edging. Also as this is all new to me, how tight should one grasp the shaft for the Jelq stroke, obviously not to the point to cause pain or injury, but is there a point that is better or worse for the gain? I also noticed that if you are up against the Glans with one hand and grasp the base of the shaft with the other before letting go the first that it make sort of a balloon in the middle. Is this good?