I had a bad experience with a stretchy cock ring (rubber band). I fell asleep with it on and got a thrombosed vein. :( That was many months ago, and while the vein still gives me some trouble, I decided to try a rigid ring.
I used a releasable zip tie and fed it, with great difficulty, through a rubber hose of a broken tire pump. Hey, might as well recycle. I’m still not satisfied with it, as the latch is exposed and gets uncomfortable after a few hours. After I post this I’m heading to the hardware store in search of a big rubber O-ring. Metal rings scare me.
Anyway, this thing measures about 1.75” inside diameter. I wore it most of yesterday and for about 4 hours so far this morning. It is sized so that it doesn’t interfere with blood flow when I’m flaccid, but if I get fluffed (and stay fluffed) it helps build some pressure. Of course, when I’m fully erect it really blows up my shaft.
I did about 5-10 minutes of squeezing and bending before attaching the ring, then every so often I work up a good erection and maintain it a while. I measured erect a few minutes ago (ring still on), and I’m almost 5 1/4” midshaft. Pretty damn good, considering my normal midshaft is 4 5/8”. Some of the increase is fluid, but not much.
I think this has potential. Hands free PE. Just get hard a few times an hour.