If you stretch the balls out far enough to feel a strain deep under your pubic bone... that is the only time you are having any lasting effect on permanent hang. That discomfort means you are actually stretching the ligaments that determine how low your balls are capable of going.
If you don't feel this strain that can make it mildly painful even to stand up straight, then no matter how far you stretch them... they will pretty well snap back to where they were within days of removing the stretchers.
You have to go slowly and wear the stretchers as many hours per day as you can without chafing the skin of your scrotum raw.
You also have to be careful not to compromise blood flow... do not sleep with them on as you may wake up to find they had no blood all night...
And take of stretchers off your balls become bluish or feel cold to the touch- ( being stretched out, they will feel slightly COOLER than your body temperature... but should not feel cold. They should look pink and happy )
Stretching also has to be continuous enough to stimulate the growth of new scrotal skin... to accommodate the lower hang you are after. For real low hangers, you will end up with a LOT of scrotal skin... when its cold, that skin will bunch up severely and it may seem you have made no real progress.... but when warm you will see that extra skin allows your balls to slide farther down your thigh.
As you stretch you will find you have to add even more length and , often , more weight, to attain the same feeling of deep pull that is the sign of permanently gain. Without this feeling of strain, you are not increasing hang... although, at any time you achieve the amount of hang you like, you can back off the weights or length just enough to eliminate this deep pubic strain and simply maintain that level of pull sheerly for the pleasure of the weights and the swing.
flaccid, my cock hangs 5 to 6 inches. When I started ball stretching, my balls were very tight and never hung, but stayed snug to my body.
Today, my balls, at most temperatures, hang just lower than the head of my cock.
With 4 lbs of stretchers, they hang halfway to my knee.