Replacement Wheels for Jotag Dolly

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One of the black plastic wheels on my Jotag dolly exploded, so I need a new wheel, but the old wheel had a hub depth of 2 1/4 inches. All the replacement wheels have a much deeper hub, which won't fit on my axle. Axle seems to be pressed into a rectangular aluminum piece about 4 inches long. Any ideas?
 
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