I have a 1 year old Brute power washer. The gas cap worked fine before but not I can not get it to twist-lock. It is a basic twist cap with two little ears on opposite sides which you align with the slots in the tank opening and then when you twist it the ears travel along a slight incline to draw the cap down. It seems that the rubber gasket may be too hard to compress adequitely to allow me to turn it.
Do these gaskets get harder when in use? Is there a remedy? It is impossible for me to apply the cap.

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