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FWIW, I have a Mirage Quattro, and I also had a problem with a sore developing on the bridge of my nose. I solved it by using Padacheek's nose protector.

And yes, I do totally disassemble it when washing.

lawman change the cushion as often as you can afford to. I would change mine every week if possible. Something about the seal of the mask, it quickly wears and does not seal properly. Good luck