I sometimes get a minor donut , but no spots or blisters with the way I do it.
What I’m not convinced about is what people identify as fluid build up. I’m pretty sure even with just a bit thicker skin and no donut, underneath there is fluid build up. I can feel it when jelqing and squeezing, this makes me quite dubious about girth gains from pumping, but hopefully it helps even out the girth at the base.
If I could pack more of the cylinder it could be more beneficial though.
Walter I honestly think that Girth gains come from the penis being expanded under vacuum for an extended period of time. Like having a 30 minute hard on everyday. I always do bundled stretches for about 10 minutes before going into the tube. Then after I come out I do some bends and slinkys with the clamp on very loosely so the erection level is 30-40% and no more. I feel like the pumping in between helps to further weaken and push the tunica more. I have had a lot of success doing this. I have gained about .25 in Mid Girth over about 6-8 weeks.
Current 5.5 NBPEL x 5.75 Base EG - 5.25 MSEG 7" BPSFL
Short Term Goal 6 NBPEL x 6 MPEG
Long Term Goal 8 NBPEL x 7 MPEG (why not dream BIG?)