Okey Dokey....
I drilled it today with a 1/16" drill and lightly countersunk the holes. I poured some water in the gutter on each side to see the result and am happy to say that the gutter drained, albeit slowly to almost totally dry. They drained down the edge of the windscreen mould. I treated the holes with zinc primer and you can hardly notice that they are there. Once it's painted they will just look like they were always there.
Thanks for the advice, I might have drilled them a lot bigger otherwise and it wouldn't have been anywhere near as neat.![]()
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