hi i have made and used stents i used tubing from nasal cannula and a hot glue gun i would start with about 4-5 in of tubing and with the glue gun fasion a ballsp on one end and a bell shape on the outher the bell shape would enter the sphincters fairly eisely but not come out buy itself i used the ball end to push it into place just pressing on my member behind the ball till pee flowed from my member w/o control once it was in place i felt little or no discomfort and pee flowed with no control. when i wanted to remove the stent i would press my member back of the ball on my stent and work it out.when i was dooing this i only had lousy cvs or depends diapers so trying to stay dry was next to imposible.