Put caulk around the hole, then put a short bolt into the hole and tighten, it tightening it makes the roof bend or deform use glue instead of caulk so you dont have to tighten it too much.
Or... get some roof seal tape, one name is butyl tape, just tape it with this stuff and forget it, it will seal it for many years.
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my bus thread, https://www.skoolie.net/forums/showthread.php?t=8860&highlight=bubb
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