ok, so i took apart my transmission and found out the following:
i don't remember exactly what year 626 i got the transmission from but it is EXACTLY the same as the protege 2003 transmisison.
i believe the 626 was like a 98-99 year.
first, the LSD drops in wihtout the need to shave anything. i compared both housings from the "OLD" tranny and a 2003.5 masdaspeed protege and they are IDENTICAL. same everyhting.
another peculiar thing, as opposed to what the OP said, both nuts on top were in fact 32MM and not a 27MM and 32MM as the OP had said.
this lead me to believe that in fact there are TWO types of transmissions.
i will suggest that if you go to a junkyard and would like to make sure you are getting a transmission that would have the LSD just drop it, to take off the black oil pan on the side and make sure BOTH nuts are 32MM.
i will be able to prove this theory once i break this transmission again.
i found out what that hole you were talking about is.
it holds a part that has a long rod.
this are the pictures i could snap.
i'll snap more today
on this picture you can see exactly what goes on that hole.
let me know if you have any more quetsions.
you can txt me at (786) 567-8643 and i'll be more than happy to snap more pictures if you need to.
also, no video..soryr..i am doing this alone and i don't feel like putting grease on my video equipment.