I've been doing theese for a few months at the beginning of the year and here's some things that I learned in the process that I think could help a few guys out.
I got problems with balls being sucked into the pump when I went up in size by switching from [words=https://officialhydromaxpump.com/?uid=6&oid=2&affid=98]
Bathmate[/words] [words=https://officialhydromaxpump.com/?uid=6&oid=2&affid=98]Hercules[/words] to the [words=https://officialhydromaxpump.com/?uid=6&oid=2&affid=98]Penomet[/words](there's a difference of about 1" in girth I belive) and the only solution I was able to found was to place the pump with the bottom wall of the [words=https://officialhydromaxpump.com/?uid=6&oid=2&affid=98]gaiter[/words] as close to my shaft as possible to miminize the space that's created by a pump between your shaft and the edges of the tube(gaiter) and it worked great to keep my balls outside the tube for the side and downward streches, however when I tried to strech upward my balls got sucked in so I removed upward streches from my workouts.
I attached a rope(it was the actual red rope that shipped with my [words=http://www.mattersofsize.com/join-now.html]
PA[/words] :lol) with ducttape to the [words=https://officialhydromaxpump.com/?uid=6&oid=2&affid=98]
bathmate[/words] and used it to assist the streches(basically I turned the [words=https://officialhydromaxpump.com/?uid=6&oid=2&affid=98]
bathmate[/words] into a sort of
hanger) witch allowed me to use both hands to secure the [words=https://officialhydromaxpump.com/?uid=6&oid=2&affid=98]gaiter[/words] at the pubic area while the rope was tight to a door knob and do all the streching by leaning away from the door. For the bottom streches I kept the rope under my foot and used a squat kind of movement to create the streching while using both hands to press the first ring of the [words=https://officialhydromaxpump.com/?uid=6&oid=2&affid=98]gaiter[/words] into my pelvic area.