You could buy a copper spoon if you have access to the back of it and try filling it with that? I used one for the first time doing some body work the other day and it worked well.
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I've got one, played around with it a little tonight. Still trying to get the hang out it, but thanks for the tip!
I'd cut a strip. I had a similar gap on my CJ floor and warped the **** out of it trying to fill it in with wire.