I cleaned up a few 022 switches a while ago and they all tested out fine before placing on the layout. Then I placed them on the table and everything was working fine. Then I had the audacity to screw the track down to the table. Now I am getting a short on my lower level. I am suspecting that it is one (or more) of the 022 switches causing the short once they were screwed down to the table.
I remember a thin piece of cardboard coming out of one of the switches when I cleaned them up, but it worked fine without it so I removed it. I can't remember exactly how the cardboard/insulation was placed inside the switch. Do I just cover the center rail straps so it doesn't contact the base plate?
I found this picture on tandem associates, it appears that there is a small piece of cardboard under both the center rail strap and outside rail strap. Is this needed? Is it common practice to need to place some thin cardboard in the 022 switch? If so, where is the best place or most likely cause for a short?