Mick , Why not turn a boss to cover the screws. With care a big woodscrew with the head cut off in the center of a circular piece of hardwood held in a drill chuck in a vice. With care a nice domed boss with a dummy horn push can be made . Then lots of Black paint and held on with double sided sticky. or even 2 screws from behind. CBS has ahorn push #HPUSH on p42 of issue 32.
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