Go to Home Depot, and buy you a clamp there. They're $2...get a medium.....they are the best made, and easiest to use, that I've found yet! I've been using mine for months.....clamping.....clamped squeezes......it's taken a lot of pressure! And I'm not saying I'm a monster.....but 6"+ base girth.......I ain't no little guy....they work good! Just put a piece of silicone on, then clamp away! Just start slow!! And to answer your question.....I put mine on, after the [words=https://officialhydromaxpump.com/?uid=6&oid=2&affid=98]bathmate[/words], and leave it on, good and tight, for about 10-15 min, and then loosen it a click, or so, let a little pressure off, and then tighten a click......and so on, like an adjustable cock ring......for about 30 min to an hour, depending......just pay attention to color, and all that good stuff!