You need to first get a Universal Pump Sleeves on ebay for I think $5 shipped for 2. Then you will need to get a 5"x5" 1/4" rubber square you get at a hardware store like West Lakes but any store should have it even walmart. Anyway find your erect girth and I'd say add a 1/4" or 1/2" around in a circle so you slide the rubber square like piece over your penis while inserting into girth hole u cut. This way when u pump you will have no pain from the pump around your dick area and no marks or anything. This will always restrict your balls from getting sucked up and only stretch your dick and you will see much much much better gains from doing this. I'm on my way to the 200 mark on my [words=https://officialhydromaxpump.com/?uid=6&oid=2&affid=98 ]X-40[/words] but can't build the pressure but I know I could do it now without having my balls sucked up haha. I just tried the 5"x5" piece and it works great! no pain around the pump part but my hole was a little too small so make sure it's a little bigger since it might restrict girth gains if the hole isn't big enough. I'd say find the girth u want, cut the hole and your good. One thing I would suggest is getting a Rubber O-Ring the type with a Flat washer like o-ring with the biggest hole u can find. Then cute the hole as big as the one on the 5"x5" rubber and put the smaller rubber o-ring on first which will help keep your balls from getting sucked up, then slide the 5"x5" piece over top the smaller o-ring. I'd suggest u get a manual pump so u can pump by hand and make sure your dick and balls are in really warm water otherwise it won't stretch. Good Luck Brother!