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I had our local Porsche Approved Bodyshop carry out the work, not that it was approved by Porsche of course, but the level of craftsmanship is excellent. I'm not sure of the technical details other than the horizontals were cut out, a patch grafted in behind and the surface was built back up. Having looked at the finish very closely it would be impossible for an unknowing eye to see where the work has been carried out.