I recommend using distilled water for this as normal tap water or bottled drinking water will have minerals.
Actually, I had the same problem but figured it out:
The threaded holes on the PSU go INSIDE THE COVER. This means that M3x10 will arrive flush with the cover end but you’ll notice the hole at the end is bigger than the screw. I found it easier to tile the machine with the PSU up so properly align the cover.
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