Awesome precision job with a mitre saw, what kind of setup did you use?
There's something I dont understand: If the fins are 4mm high and the perspex pocket is 4.5 mm deep plus 0.5mm gasket, there's one mm of free space over the fins, is impossible that the fins are firmly against the top as you say.
For that to happen, the gasket thickness need to be substracted from the pocket, leaving it at 3.5mm depht.
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