Mexico...hmmm. Can you find a source for similar foam (flat)? Can you source a replacement weir?
I'd replace the weir foam if you can find it, or get a replacement weir. You can find the skimmer model number on the underside of the skimmer cover. Search for weir with skimmer model number. Pretty easy in the states. Not sure in Mexico.
If the existing weir has/had Styrofoam that is now not floating, yes, a pool noodle will work, done it many times. Just cut a portion that will fit the where the foam is/was.
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