Mistress writes:

In article , says...
Now works fine but has small
hole through middle, does this mean the micro part is now focused
through the hole and not diffused

Good question. I have no idea what effect the hole would have.

Nothing at all. 2.45 GHz (5 inch) microwaves won't go through a 1/4" hole.

But that's even irrelevant since the plate is most likely just an inert
waveguide cover, not a "diffuser".

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