Quick SDA mod question

There is a round plastic disc covering up a hole behind the PR on my 1C's. Should that be sealed?....right now it is stuck on but not permanent
Polk SDA 1C Upgraded, Eastern Electric Minimax Supreme DAC, Parasound HCA 1200ii, Belles 21a Preamp, Rotel RSX-1056, Matricom G Box Q, Blue Jean & Signal Cable interconnects, Sonographe SG-3 TT, Panamax M4300-PM

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