A study published in 2019 that looked at various medical, traction, injection, prosthetic, and reconstructive procedures states that complications are “likely underreported.” The same study also says that the worst complications, although rare, can be “devastating.” These include penile fibrosis, sexual dysfunction, and even (in at least one case) death from pulmonary embolism. If you do decide to undergo a penis enlargement procedure, consider all the risks and follow all post-op instructions carefully.
The force you need to apply is just enough to induce micro-tears in your penis tissue. Fortunately, this is way less than 3 lbs. of force. In fact, the micro-tears are safely generated by applying small to moderate force for long periods of time. Applying a small force for long periods of time (4-6 hours a day), is the correct way to create the micro-tears and go about penis stretching. It’s also the best way to ensure safety and prevent injury.
Stretching with weights. Weights or stretching exercises won't bulk up your penis -- it's not a muscle. But hanging weights off your flaccid penis may stretch it a bit, O'Leary says. The catch is that it requires a freakish degree of dedication. "You might have to wear a weight strapped to your penis eight hours a day for six months," says O'Leary. At the end of it, you could be lucky enough to gain about half an inch. Risks include tearing of the tissue, burst blood vessels, and other problems.