Tube collapsed

I started with the rudder today. Made a fixture from ply wood to make the first bend in a 7/8″ tube. There are 4 bends with a radius of 6 inch. But when I started I saw the inside wall of the tube started to collapse, so I stopped for now. Not happy with that but surely I will find a solution or this.
Maybe it is OK as you can’t see this once it is covered, so maybe I just need to continue, and if what you see here is all than it’s probably OK.

Posted a question on the Yahoo Airdrome Builders website, see what advice the guy’s have for me.

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