Talking with the craftsman, we had a discussion regarding new vs old. As he pointed out, the new rads are cheap throw aways, made of aluminum with plastic tanks, gaskets and are crimped together. There really isn't much to fixing them as the most they can do is tighten a crimp.
The old type brass and copper rads were made to last and overbuilt in many cases. At least a small leak could be stopped by pinching off a tube or applying a bit of solder here or there.
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