I am trying to find a way to install a component in an aluminum box. This component comprises a rectangular unit measuring about 80mm by 100mm and a power supply of similar dimensions joined by a 5mm cord.
I do not wish to cut and splice the cord so I'm looking for something like the aperture on an SLR camera but large enough to admit the above described. This could be closed around the cord so as to be both vapor and light tight. What are possible solutions?