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Nice find. 200mm (8") handle should provide plenty of torque. Nearly a 4 hour print for me.
For those without access to a 3D printer a new $17 cap or new $6 gasket (15613-PC6-000) usually solves the problem as the original gasket fossilizes and requires extra tightening to compress it making it hard to remove. That gasket doesn't appear to be a specific S2000 part so try your favorite Honda or Acura parts desk.
Hobby Lobby PLA printed and works perfectly. Only difficulty was the four (4) hour print time which may rule out the printer at your local library especially if they have a high hourly machine fee. 140g of filament (14% of a 1kg $15 spool) so material cost is about 2 bucks. Color makes no difference printing this kind of stuff so I just used what was on the machine from the last print which happened to be black.