Here it is

Hi nice dummy load 250W but have imperfection...
central pin brake pin from dummy load--- nedd to be conected trought coax line...
Moving the pin is applied to the resistor and it quickly breaks the connection... too stiff a connection. I haven't tryit  it but maybe the so-called copper braid can help
see exxsample https://www.facebook.com/share/v/1A7KNnTkdt/

you use a soft copper line as a strip line... bow