These shrinking discs work well on steel stainless aluminum brass and may on some other metals.
How to shrink stainless steel sheet metal.
Get used to this idea and your abilities will grow.
Heating up metal and throwing cold water on it may shrink it a tiny bit but it makes distortion and hard steel.
Get an idea of how.
Some shrinking can occur with only room temperature cooling but is greatly accelerated and multiplied by cooling with either compressed air or water squirt bottle or rag but water generally tends to provide quicker cooling.
Heat to blue only and shrink that much.
Do not over heat the steel.
This works the other doesn t.
It s ideal when lots of shrinking needs to be done and you don t have access to a machine.
Often called the poor man s pullmax tuck shrinking is another way of shrinking metal to gain shape.
Why not just heat it and gently hammer the swell down.