In article , kwag98
@Xusachoice.net says...
Place the pieces in a stack with the bow up, and support the ends on 2
blocks of about 4" high or more. Place a weight of widely distributed mass
to create an inverse of the bow.
The weight object shouldn't create a small area/footprint of pressure.

The weight could be a bag of sand, cement, an unbound bundle of shingles or
other non-rigid mass. You may need to add some additional weight on top of
it, but a wide, soft weight should remove the bow, maybe in as few as a
couple of days.


While this would work with certain materials, some plastics
for instance, it's not going to have any effect on steel at
room temperature unless the load is great enough to exceed
the steel's yield strength. In which case the effect will
be immediate, but will be difficult to control. Much better
to control for deflection than applied load.

Ned Simmons