I had one of those. I could not find an ID either, but I didn't think it was any good.
Mine was in a depression that it made in the snail's shell, to perfectly fit its own shell. Seemed like it used an acid to "melt" its way onto the snail's shell. The snails shell did not have a hole in it. Once in a while, this black snout, that is eating off the glass in your video, would take a bite of the snails foot and the snail then scrunched up.
Thats when I decided to get rid of it. Oh my it was difficult. I used a dental pick to pry it off the snail. It was on so tight.
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