Worn holes in stanchions - ideas for a plastic insert?

Our stanchions are solid aluminium. I cut some clear rope reinforced air hose to length. Slit it so I could install without taking the wires off and pushed them in to place. I have a cable tie on each side of the stanchion to hold the tube in place. Been there for a couple of years now and works fine. Tube is white, cable ties are white. All looks neat
 
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