Smart, Bio-Hazard.
The most direct solution to your problem, eXacto, is to change the existing tube O.D. If you have a tube cutter, try replacing the cutting disk with a blunt steel washer (will have to dig for the right one). You now have a tube crimper. With this you can scrinch the tube down - barring heat treatment, how much depends on the alloy, wall thickness, and care you take in doing it. Forming a soft barb pattern this way is easy. But practice on scrap pipe first, and don't even try it if your radiator pipes are too short for mishap.
Does anyone else know of ways to flare or crimp tube?
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