Good mist output but a serious design flaw in the tank cap

I got this because it's huge and you can put essential oils in it for diffusing. I don't use my expensive oils in it, but it does fragrance the room using my cheaper (yet still decent) oils. It is easy to use and the design is simple. There are a few issues with it, though, and I'm not sure I'll keep it. I got it less than three weeks ago and have used it daily. My issue with this is that the screw-on cap that closes the water tank, has a piece in the middle with a spring that has already fallen apart. I have managed to put it back together so that it's usable, but then today, the rubber gasket decided to come off and now when I turn the tank over to put it on the base, water just pours out. If I'm careful, it doesn't make a mess, but I'm just not sure this diffuser/humidifier is worth keeping. The mist output is great and adjustable. It does help to humidify the room. It's just that one piece, which is a very important piece, that won't stay together.

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