Here is the hole, with expanding foam squirted into it. I like to insert the nozzle deep into the hole, and put a lot of foam in. The can says to only fill the hole 50%, because the foam expands a lot. I fill it all the way, because if the excess bulges out, it’s not where anyone can see, anyway. The foam hardens in a few minutes, so it’s important to spray it in quickly and thoroughly.

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