Reforming Boat Transom Drain

I bought a boat. It needs some work. One of the 50 little projects I need to do is re-form the transom drain. The transom was replaced or at least re-welded at some point and whoever did the work welded in a piece of aluminum tubing to serve as the transom drain. This piece of tubing has gotten bent and will no longer accept a round drain plug because the tube is no longer round. It looks like something was dropped on the tube and caused a dimple or two in the side of the tubing.

Try to ignore the ugly welding job. The transom is water tight.

I've got some ideas. All involve some sort of tool that fits inside the tube and presses the tube back into shape. I thought about an expanding concrete anchor, tubing expander, or swagging tool.

• The concrete anchor won't be strong enough and I can't get one that's 0.90" OD.
• There isn't a tubing expander that will fit that size either.
• I could make a swagging tool that would fit but I'm afraid that if I drive a tapered tool into this tube, I might not get it back out without doing more damage than I have now.

Any other ideas? What would you do...besides drilling out and replacing the existing tube.

FOR SOME REASON, I CAN'T GET IMAGES TO DISPLAY IN THE POST. PLEASE CLICK THIS LINK FOR THE IMAGE

http://themaintenanceguy.com/gfimages/Transom_Drain.jpg

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Reforming Boat Transom Drain