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if the button popped out, it's probably broken, not the spring.
take the lid off, and turn it upside down on a towel or soft cloth , and remove the screws. nothing will happen except the light bulb over your head will come on.
when I repaired mine, I improvised with a piece of plastic that I filed to the right dimensions.
there is a cavity under the button if the lid is upside down, and in that cavity is where I put the plastic.
If the spring is broken(sounds like it is not) you can replace that.
If the buton is broken and can't be fixed, buy a lid from someone whose lid upholstery is trashed, and use the guts.
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