My thought is to take a firebrick and put it in under the shelf to
support the center. That way there won't be a lot of weight load being
suspended by the shelf. That would up the work weight capacity.
I've gotten in the habit of sticking a couple of the hard fire brick in the
bottom of my forge for two reasons (at least) - One: as work rests (who
needs shelving after that?) and two: as heat soaks. I found that a forge
that heats up fast will cool just as fast. I'd stick a piece of metal in
there and it would suck the heat right out of the forge. A couple of hard
bricks in there help to offset this affect. Takes longer to get the forge
up to temp but it holds it there more stable. The bricks are just cheap
junk from the hardware store but they work for this kind of thing for a
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