Shalom, Kvod HaRav!
You posted last year that a French Press is permissible on Yom Tov. I am wondering if there is a problem with inserting a filter, making a hole in it, and screwing it n place?
Akiba Gali 
Danielle Prizament 
fito Jamous One thought on “Coffee filter in French Press on Yom Tov”
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can you show me what it looks like when you make the hole?