I've been reading a book about, prisoners of war making radio's to here what was going on in the war front, risking their lifes , making these radio's as the would have been shot if found, any way these people were in my opinion the real radio amateurs, making the sets from what ever they could find, so I got to thinking about making a capacitor to start with and made this one , got a measurement of 2988 pf going to find ways of making other parts and see if I can make a simple radio.