You might be interested in purchasing the doubles bar from the Cobalt Flux site. It's a little overpriced for being just a hunk of metal, but it will save you the time and hassle of making your own solution.
The doubles bar slides down onto screws that are mounted in the left and right side of the Fluxes. Once in place, the pads won't spread apart from one another and you have a small (2-3 inch) platform between them to walk across.
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CF cbox mods and more at the 'Pad'