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Sorry I don't know, all I can say is the bubble on mine looks a bit bigger than it did when new, it's now about 10 or 15% larger than the red circle and I'm pretty sure it matched it originally so it could well be evaporating, there are screws that look like you could access the plastic bit if you're brave enough ... perhaps e-mail a dealer?
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Regards Stewart
Stewart McBride
My  ... mostly the chaff ... these are a bit better ...
You’re only young once, but one can always be immature.
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