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Just take it easy with the hole saw, not too much pressure and not too much speed, don't want to overheat the area or start tearing at the fibreglass.
Or do what we've always done, drill lots of small holes around the edge, break the centre out carefully, then file smooth. More chance of causing damage, but works a treat if you don't have access to a hole saw. Or too scummy like us to buy one the right size.
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