In reply to:

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Did the caster give any indication if there was a way to improve the diffusion of light through the button?

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He said he could improve things, but didn't say how. He needs to at least fill in those cavities in the parts. Maybe the backsides could have some sort of diffusion partern applied to them, sort of like they use on car instrument panel overlays.

Here's what the red looks like lit up.

Stu