The video at the link above shows how to remove the plastic parts. But I had a hard time putting it back on. So I don't recommend it. I recommend pushing the tongue of the pad with a screwdriver, putting a piece of thick paper on top. So as not to damage the pad with a screwdriver. And at the same time push this piece into the gap for greater tightness. So that it holds. I did one side by removing the plastic. And then adjusted the sealing paper. And the other side the same way, but the tongue of the pad came out half a centimeter. And I pushed it back deeper with the paper. You don't have to worry too much about the plastic or the rim, I twisted, pressed and tortured them, they don't care. Without the sealing papers, the tongues will gradually come out of the plastic.