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Ayuh,.... Move the camera back a foot,..... I can't tell what we're lookin' at,....
So you want to seal that cracked / blown out area.-----Try JB weld.-----But I think a fresh water used assembly is a better option.
Ayuh,..... I'm with racer,..... Epoxy might slow it down for awhile, but a clean replacement housing is the true cure,.....
Donno where you are, but craigslist, 'n ebay come to mind,....