The only problem with this episode is - if a cloaking device cloaks itself, how the **** do you install or repair it? It's portrayed as a very delicate piece of technology that is a mystery to Federation scientists...and INVISIBLE. I couldn't even imagine putting an invisible 8-track into an invisible 8-track Player, much less installing an incredibly complex device that is literally 'shrouded' in secrecy. I know, I know....'plot device'. But in a thread with this title, it's worth noting.