I can try... But I'm at a loss for why anyone would ever do that... You can just letterbox it if you want it to be 4:3...
The overall idea was how to make the entire series have same format if one wishes so.
If you letterbox wide screen eps you also shrink the hard subs - they may get very small on a 4:3 screen. For example we've got an older 20" 4:3 lcd tv mounted under the ceiling of our bedroom ... letterbox or zoom a 16:9 show is no problem with external or dvd subs which can be set to a readable size. Fixed subs are often hard to read when letterboxed.
Thats why it is a good Idea to keep the hard subs in the center. I took eps 16 and 17 and watched them zoomed 4:3, I think both have about no more than 10 or 15 one liners each which are outside 4:3, the rest ist already fine as it is.
Well maybe we should buy a new screen :-).