Joshua, sorry to say that, but do you really think anybody in his right mind would attempt to remove the adapter casing before unplugging the adapter? Is such a thing even possible? You gotta give people some credit. I doubt such morons even exist. If they do, maybe it's best they don't reproduce. Darwin Awards, you know?
Anyway.
I'm attempting to do the repair as well. Just to say, I had two adapters I wanted to repair, one was a 85W: almost impossible to open. It took ages. I cut it with the knife, all around, then took some pliers to it to force it open, I ended up cracking the case. All that before realizing my soldering iron was toast. I was planning on borrowing one so I didn't give up. I took the other adapter, a 45W, this time, no knife, I went directly with the pliers, it opened directly, no damage. I think there are a lot of different versions of the adapters. Depending on the one you get, you might be lucky.
Both of mine, I need to unsolder to open any further. I'll come back with more news.