depending on your dedication you can gain anywhere from 1.5 to 4 inches.i have a couple out in texas ive been aquainted with for some time.the guy suffered from short cock syndrome.needless to say..he started pumping 20 months ago and has gained 4inches in length,and 2.5 in girth.his wife is very happy.
4 Inches in 20 Months? eh... that sounds a bit hard to believe....
I pump every blue moon or so, just for extra length and thickness.
Not a strict routine pumper.
I went from 4-4.5 to a 5.5-6" permanent growth.
I've always been decently thick, so I stuck to a smaller cylinder for length.
There are cases where guys hurt themselves pumping.
Heres the main Causes:
1. Incorrect Size Cylinder
2. Incorrect Vacuum amount (5mm/hg is near max)
3. Rushing on vacuum application
4. Not using a Warm-up procedure
Also some men that have loose skin on their penis shaft when erect may be better candidates for enlargement.
I have heard from others that tried pumping, and were unsuccessful was due to very tight shaft skin. (Mabee they took too much off during circumscision?)
Don't know if there is truth to that... I'll start a poll..and see what we find.
C