El Wino, I had the same thought along the lines of length, but I don’t think the idea applies for girth. Hear me out.
When I used to stretch, I warmed up to get the tissues as pliable as possible, and - after the session - when I had it at it’s most extended state, I held it stretched under cold water. My theory was that length was obtained through creating micro-tears, and by stretching your tissues to the limit, then forcing them to try and recede by running cold water over them, I thought the tears would come easier that way; I had some success with this, as I would hang longer (albeit, thinner) throughout the rest of the day/night.
My problem with applying this theory to girth is that girth and length work on two different principles - while I believe length is dependent on micro-tears, I think girth is dependent on blood chamber expansion. The biggest limiting factor in girth is getting your body to retain it’s expanded state, which I feel is completely dependent on blood - get your body to adapt and keep as much blood in your penis as is in it when it’s fully pumped and plump, and we’d all be making gains in a few weeks, but it doesn’t work like that. After a good session, I find my dick becomes a sort of fatter, limper version of it’s old self; I love the girthy feel, but the hardness leaves something to be desired. I think the body needs to adapt to a sudden increase in blood demand to retain the rigidness, and when your body is forced to choose between growing thicker and limper, or harder and thinner, I think it will try to remain rigid, as that is more advantageous to reproductive success. Since I think the biggest deciding factor in girth gains is blood flow, I wouldn’t do anything to decrease the blood flow to said area - in this case, putting cold on said area.
That said, let us know how it goes, since I assume you will keep experimenting with this.
Edit : Ah, I see you’re saying ice it down WHILE in a clamp, huh? Interesting, I think I might agree with this line of thinking, as you’re forcing the chambers to retract in an expanded state… worth giving a try, I’ll let you know how it goes for me.