On my GT2531 there is no protection needed - but it was designed that way! On the OP's tripod a bit of rubber sheeting may well be a good idea.Looking at the gitzo spares diagram @johnf3f idea may work. A small section of rubber gasket either end may help protect the tripod body and give a tighter fit.
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Sounds like the coupler idea will be perfect..... and a lot cheaper than a gitzo supplied option (as much as I like gitzo quality and build the cost of their spares is a bit high).It seems we are reinventing the wheel a tad, and Gitzo solved it themselves with this kit.... now discontinued and I cant see it in stock anywhere...... back to the workbench!
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