I did one on a higgins I had and just took a piece of pipe and slid it in the tube and tapped it and they came out. I think they are like little brads that kinda swivel. If that makes sense.
i usually stick a 1/2" boxed end wrench in there and use the side of the wrench against the pin and push backwards using the head tube as a lever sorta. ususlly "pop" right out with the right amount of pressure.