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I keep mine in poor condition to deter theft

Don't reckon it would hold just off the screws and doing the whole reverse polarity thing seems like a bit of work to me but I'm lazy lol. Don't worry, I'm also thinking of some options:-)
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Number plates are made of ally:-(

FanTapstic!

I suppose you could make something to slip over the numberplate before you start filming.... I for one would never remember to do it though!! lol