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Here is my method for doing the outside angle on the tube.

I use the flaring tool to begin with.
Insert the tube with the flair already formed on one end into the hole along with the O-ring. I also use 4200 around the tube and O-ring.
Use the flaring tool to flare the outside end of the tube until the flare hits one side of the hull.
After that I finish the angle side of the tube with the flat end of the ball peen hammer so the flair fits the angle of the hull.
You don't have to hit the tube very hard as it should bend fairly easily with the hammer.

Works for me and looks just like it would if you used the flaring tool only on the non angled installations.

Good Luck