[QUOTE=Gammaboy;842980723]What’s the shifter trick on the heater box inlet/outlet?[/QUOTE]
An old guy who worked at a rad shop showed it to me ages ago. You get an adjustable shifter and find a reference diameter from somewhere else on the pipe:
[img]http://images.plebeians.net/_data/i/upload/2018/04/29/20180429014852-37aab973-xl.jpg[/img]
Then you put it around the narrow section of the pipe end, and rotate it around on the pipe end to reshape it to round:
[img]http://images.plebeians.net/i.php?/upload/2018/04/29/20180429014746-4af2bab3-xl.jpg[/img]
Works a treat on softer metals like the heater core or various rad pipes.
Its a pretty neat trick, which i got to show a plumbing apprentice when he was replacing our home HWS. Was fiddling around with a special tool to reround it from the inside etc, and it kept getting jammed in the pipe. 30s with the shifter and all sorted.