Putting in a new counter top, on a built in desk. Walls on back and sides. Old top had a large hole to run wires down to the computer, power, etc. I would like to leave the top approx. 1 ½ inches away from back wall to easily drop wires down. I?m looking for some suggestions on a material to fill that gap? Something like foam or rubber that could easily be slit, and a wire could be fed thru it. The best material for this space is a very course thick bristles like are used in tooth brushes. The bristles should stop something from falling through the crack but be flexible enough to force a wire through by hand.
Any suggestions on where to buy 8 feet of this bristle? Here's an example ( not that I want to buy 8 on em:
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