Here's the info I have on it.
Follow the official bulletin and also the other document has you put a felt pad where the upper cover rests when closed. Do both. Someone told me the metal washers by the hinge was an old fix, I'm not sure if it has to be done or not. I just did one today (8 plastic washers on plate + the felt pad) so we shall see how it works.
I don't see how the washers do anything though.
11384.pdf
RU-513 Field mod.pdf
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