Attached is the service and repair material prepared and assembled by the late Richard J. Luppold in the late '80's-early '90's. Much of the material are reproductions of LIONEL's service, repair and part no. information that is typically found in the Greenberg manuals. However, there are a couple of pages of "how to" information supplied by Mr. Luppold, particularly pages 6 and 7 of the 22 page attachment.
I was referred to Rich years ago when I needed pre-war and postwar versions of the 313 repaired after they were damaged in a move from Chicago to Atlanta. He was a real gentleman and did a terrific job on the bridges.
As for the attachment, apologies for the occasional upside down page--easy to fix by simply rotating the image using the "view" button.
Hopefully, this information will be helpful to members of the forum.