Julien,
I've spent a great deal of time around steel plate. The figure of 2-5 lbs is HIGHLY innacurate.
Standard steel ballast for ships weighs 265# to the cubic ft.
By my calcuations, a cylinder of this steel measuring 2ft across and 1 inch thick would be 69.38 lbs.
Considering that the 100 lb plates in a gym are a bit thicker and larger in diameter (not much, but just a bit), this is hardly unreasonable.
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