Hi, to pass the PA ring round the bar, which I can tell you is wonderful, you will need to find the optimum ring size that will work. a zero guage for this doesn't work. I find when I want to do this to use a bar no more than 5 guage and a PA ring also 5 guage. you may need to satrt with a ring 6 guage but you will find that it will soon release to a 5. It took me a bit of doing but eventually found the optimum. Trust me its amazing when you are hard and you cum, BOOOtiful!!!!!!!