I use the alco 200 series gear
Once you have it apart you will see a half moon indention on one side
either dermal it down or shave the side of the 2028 -100 (see my other posts)
I removed the armature and lined it pretty much where the rivets under the 2028 -100 are to what use to hold the armature on.. (to me Lionel could of done this back in the day )
I dont have any real instructions Im a hands on type of a guy . (side note my mom was that way (lol) When she cooked ... well you have to just be thier to know what to do... (lol) daniel