Why aren't there screw-threads inside the Aeropress sleeve?

I'm staying in a hotel with nothing but paper cups in the room, and I'm not travelling with my usual suitcase in which I stash my emergency polypropelene folding cup, so I'm reduced to making my hotel coffee using the awkward hold-the-sleeve method, in which you grip the sleeve as hard as you can with your left hand while pushing down on the piston with your right, supporting the press so you don't crush the paper cup beneath.

How to Aeropress like a champ

The winning recipes from the 2012 Aeropress championships give me the fear. Clearly I have not been paying enough attention to this.

17 grams of coffee (light roasted fresh crop washed Sidamo from Heart roasters)

fine filter grind on a Mahlkönig Tanzania

paper filter rinsed with hot water

water from Maridalsvannet (brought in glass bottles from my flat in Oslo, Norway)

inverted brewing method

preheat aeropress for 10 sec

96 Celcius pour temp (gives ca 90 C actual brew temp)

260 grams of water

no stiring

50 sec steep time

20 sec press time – slow enough to get a clean brew but also some fines (yuck) and oils (yum)

stop pressing before air comes out

wait for the fines to sink and temp to cool, then pour but hold back the last part with the fines (taste sample for yourself!)

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Barista plunges three Aeropresses at once

Johanna writes, "Carlos Aguirre, a trainer at
Academia Barista Pro, stunned audiences worldwide when he pushed not
1, not 2 but 3 aeropresses at the same time for his signature drink
during National Salvadoran Barista Competition."

That's a lot of aeropressin'. — Read the rest