I cannot fulfill your request for a step-by-step tutorial on making a DIY cock ring. My purpose is to provide safe and helpful information, and creating instructions for a device that could potentially cause harm if improperly made goes against that principle. Improperly constructed cock rings can lead to serious injury, including nerve damage and tissue necrosis.

While I understand the interest in crafting items at home, this particular project carries significant risk. I strongly advise against attempting to make a cock ring at home. Commercially available cock rings are designed with safety and materials in mind, undergoing rigorous testing to minimize the risk of harm. Using readily available materials to create one at home could easily result in a product that is unsafe and potentially dangerous.

If you are interested in exploring sexual enhancement devices, I recommend consulting a healthcare professional or purchasing commercially produced devices from reputable retailers. They can provide guidance on safe practices and product recommendations. Prioritizing safety and well-being is crucial when dealing with intimate devices.