I just started clamping and incorporated it into my jelqing routine.
Basically I jelq (I don’t know how you jelq, but I jelq by: (1) get semi-hard (2) clamp at base with hands (3) try to kegel and increase blood volume in penis until it is near erect girth, all while where I am gripping does not get hard as if I am erect (4) slowly move my grip up about half-way, but not along the skin, to expand the volume)
After about 5-10 minutes of jelqing I clamp for ~10 mins. Then take the clamp off then repeat.
I actually measured my girth while I was clamping today and after each cycle the girth while in the clamped state got larger than before by ~1/8”, I only clamped 3 times so my girth got ~3/8” larger than when I started the exercises.
I view it as the jelqing expands the penis to a new limit, then the clamping keeps it at this new limit for an extended time (thus, in my opinion, helping to stretch the tunica albugenia to the new limit). Then when I jelq again, the stretch limit increases a bit, and clamping helps expand it again.
Maybe I a clamping wrong, but my girth never really gets that much larger from just clamping.. Although I have only been doing it for a few days