Hurricane Nut Install Question

I recently picked up some Polk 7Bs that I am overhauling and I was wondering if I am supposed to only use hurricane nuts on the speakers or on the radiator as well? My understanding is that the radiator must be tightly fastened against the cabinet, wouldn't the hurricane nut raise it slightly? Additionally, should I look into replacing the foam rings under the speaker? If anyone has any pics of their hurricane nut install it would be appreciated, I have been googling a bit but cannot find my answer.

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