I agree with you Stretchin, any exercise that cuts off circulation should be avoided, such as wearing extenders with a noose.
After discovering what a crap design mine was, I almost gave up wearing it after a month. I started looking for an alternative and found a few PE device sites that manufacture pulleys for night stretching in bed, they all used latex condom-like weight attachment sleeves.
Someone must have experimented enough to prove their safety and the simplicity of their design appealed to me, there is no localised restriction and the latex expands with the penis.
As I said before, I modified my extender to replace the noose with a latex sleeve and constantly monitored for any incidents but soon realised that I could wear it comfortably for many hours without problems. It also stays in place and keeps a constant traction force unlike the noose which would loosen all the time.
A vacuum blister appears at the tip of the glans but doesn’t stay for long, it disappears immediately after an erection so it isn’t really a problem.
Almost 4 months of using it and I’ve only had that one incident due to an unwashed dick and sleeve ( see earlier post)