Some interesting information and original, well old drawings showing the style
Most recent stories in Coffee Making
https://www.bankskitchenboutique.co.za/tea-coffee/coffee-making/presses-plungers-perculators.html
How to make a plunger of coffee. Understanding this will help you design a plunger
http://www.cookinglight.com/healthy-living/home/brumi-bottle-review
https://www.dwell.com/product/the-stagg-pour-over-set-691684db