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My guess is to keep the dirt and polish dust from getting inside. All polishers I have have some kind of "seal/membrane".
I too removed it from one of my units. Last time I checked there were no signs of stuff getting in. For some reason I have impression flow of air is preventing it. I easily can be wrong though so I will need to check again soon. What does inspection of yours shows?I removed mine a while back when it melted down. Polisher works fine but for the sake of the longetivity of the unit I better replace it.
I too removed it from one of my units. Last time I checked there were no signs of stuff getting in. For some reason I have impression flow of air is preventing it. I easily can be wrong though so I will need to check again soon. What does inspection of yours shows?