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Buy a new one and replace it with plastic screws. It's simple.
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Just install it yourself, plastic screws. It's simple.
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You can change the toilet or buy a lid and change it yourself.
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Go to the labor insurance hardware store and buy a new one
Very cheap 20-30
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There are latches on both sides, just turn them on yourself.
You go and see where he seems to be able to tighten it, but it really doesn't work, you stuff some strips of cloth.
Buy some double-sided tape, stick it a little where the lid touches and it won't make a sound, give it a try.
It's good to make up for it, you can go to a treasure to take a look.
As you described, your house is all-inclusive. The screws are in the back. If the toilet is too close to the wall and you can't get in, you need to remove the toilet and replace it.
It's best to find a toilet merchant to see if you can match it, if you can't match it, it's very troublesome.