Robert,
The Tiger has both double flares and bubble flares. It depends on what joint you are working on. Larry Paulick has written some information on the subject and his quest to find a tool that does the job correctly. I believe it is posted on the tech tips in Tigers United web site, if it is not on the TE/AE web site. You could also email him directly.
I have made reasonable bubble flares with a standard double flaring tool. You just need to use some finesse when you press the die in for the second step. I did a couple of pratice bubble flares first. I compared mine to a factory bubble flare to see how I was doing.
Tom Calvert