My urologist says I have phimosis and need circumcision. The staple ring size measure is 26mm but he says in market they arent able to get the same ring, rather they are getting 30mm. I doubt if thats the right thing to go for and need a second opinion. He says it should be smallr than the measured size but a 4mm bigger ring is still ok. I find that tough to digest and not sure if he is really telling the truth. I need professional advice from urologist here if I should go for a higher ring? Does it really matter so much. The doc I am consulting is quite an experienced one. Please help.