My 50 gallon black plastic loft 50 gallon cold water tank has become serious
distorted, over a period of, possibly, 20 years. The 'stress bars' holding
the two long side together were displaced, so that the tank bulges at the
top, making it difficult to seal the top (there was no 'top' that I ever
knew about. I has been opined that it would be impossible to draw the
distortion back. Now, I wonder about this since 50 gallons of water flowing
out of a tank in the loft, could cause serious damage. Does anybody have
any ideas as to how to bring it back into shape, or otherwise?

Thanks in advance,

GOG