You want the vacuum of the piston to stop the fluid draining, not the filter paper. I make mine upside down and put the filter on top for least mess.
Cheers, yeah I was just stood there pondering the mechanics of it and it dawned on me that once the plunger's in it creates a vacuum
What Olly said - fit plunger first, then add coffee and water. Known as "the inverted method".
@Crispin_Glover started
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You want the vacuum of the piston to stop the fluid draining, not the filter paper. I make mine upside down and put the filter on top for least mess.