Thanks for your answer.
I'm guessing the shield plates don't get in contact with anything in the Genesis itself as they don't go down far enough and there is also no metal parts in the cartridge slot area.
...time to see if I can make anything!
I've finally got a 32x to shove in my Genesis.
Unfortunately it didn't come with shield plates.
Although it may be a hot topic about whether they are needed or just an FCC compliance thingy... i have AV interference so i'd like to start with these!
My main question... the 32x unit has...