I have now spoken with Simon in the Aeronavics warehouse. He is sending me a replacement set. It seems that I applied too much pressure when tightening the screws, their advice (which he is going to add to the build manual) is to apply locktite to the screws and use absolute minimum pressure when tightening the screws to avoid damage to the shields.
Have to thank Simon for offering to send out replacement shields. Again DW/Aeronavics prove that they are a quality outfit.
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