The Pi 4 model B mounting holes are larger than the threads on the M2.5x5 racks, which means that I which could not use standard screws to mount the heatsink (P165-B) to Pi 4 Model B when mounted in a case, both in a standard case and in a Cloudlet CASE. I can probably drill holes in the heatsink for larger screws, but haven't bothered to do that yet. For less than $7 it was worth a try.
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