I have two tripods/ One is an Induro carbon fibre and the other is a Manfrotto 475B. The latter is the more stable. I use a Markins heavier duty and a Manfrotto 488RCO. The diameter of the top of the Induro is 2" and the Manfrotto is 2 1/4".
Graham From St. Augustine, FL. "I like photographers, you don't ask questions." Ronald Reagan to White House Press Photogs