The body does not do a fucking thing that is permanent.
The entire nature of life itself is temporal, Permanency doesn't exist on this planet.
You wanna diet and lose weight?!? PLAN ON DIETING FOR AS LONG AS YOU LIVE IF YOU WANT "PERMANENT" RESULTS.
You wanna become faster? PLAN ON RUNNING FAST FOR THE REST OF YOUR FUCKING LIFE OR YOU WILL LOSE EVERY BIT OF SPEED THAT YOU "GAINED". Stop running? You slow waaaaaaaay down.
Stretching DESTROYS the vascular system of the penis. You cannot fucking manually stretch arteries, veins & capillaries and expect them to get longer.
Give up the ridiculous notion of permanent gains & shut out the confused folks who claim to have experienced permanent gains.
COME BACK DOWN TO EARTH and give up the notion of permanence.
In fact, the ONLY permanence in this dimension we call "reality" is impermanance.
The gains we make, are tangible for as long as we perform the activity that led to the gain... this is not rocket science.
What pumpers need to work on over time is: a better shaped penis (less of a donut and a more even shaft), less blisters, less bruising and the cessation of petechia... as well as shorter pump times and slight increases in girth or length. Length requires more pressure... the sort of pressure that can lead to: blisters, bruising, excess edema and petechia. I wouldn't recommend going for much length gains... a 1/4" or maybe 1/2" over time is all one can expect as far as length gains from pumping.
But girth?!? Someone with a 4.5" girth could achieve a steady 7 inch pumped girth but a 6 inch length would have a hard time getting to 7 inches safely.
Unless the pumper is fat and loses weight. The tube will have access to more of the pumper's penis since the fat pad has been removed... this could lead to a sizeable length gain through steady and intelligent pumping as long as the weight stays off.
Young pumpers could achieve more than an older pumper does providing the young pumper doesn't do too much damage in pursuit of their gains.