The main problem that I see is the sleeve that the float button rides in.
There is a lip on the inner edge of the sleeve that keeps the float button from exiting.
Yours look pretty mangled and I don't see that sleeve as being a purchasable item.
You may have to fab your own.
In addition, I seem to remember a small spring behind the float button to keep it popped out, but I don't see anything like that in the parts drawing either.
Maybe someone else has better recollection.
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