Cathdiap, thanks! I think I better understand your design now. You are using the narrowed points to let your sphincters hold the stent in place rather then large bumps to stop the stent from moving. The bent angles are to match anatomy of the body. Using both seems to do a better job as it uses your muscles to your advantage rather then fighting against them. What is the actual spelling of the name of the string you use so I can look it up please? All I seem to remember reading is the scooby joke . Also what size is the retrival needle you use and once the device is inserted how far from the tip of the penis does the string loop stay for retrieval or how deep do you fish to hook it for removal? Also its hard to tell but is the string knotted inside the tube? If not how is it secured to the tube? I know I am asking a lot of questions but I fully intend to make this soon as I can get all the supplies and time. Thanks for this great design idea and answering my ton of questions!!!