I make gap fillers from some aluminum sheet that is about the thickness of the track metal. Pieces of aluminum flashing will do. I cut it to about 5/16 inch strips then cut of a piece the same width of the gap. I use my fingers to wrap this strip around the track pin and then pinch it with a pair of wire cutting pliers to tighten it around the pin in the gap. Adjust the 5/16 inch size if the gap is not filled or if it overlaps or just let the over lap get pinched together and hang down below the rail out of the way.
The small pliers may be called Nippers and have the wire cutting part on the end running perpendicular to the pliers and will encircle the aluminum strip. The aluminum conducts electricity and is softer and easier to fit than tin can or other stiffer metal. I have dozens of the gap fillers on the layout and fill sections with large gaps when I had to take the three sections of the layout apart each year to store and then reassemble.
This has reduced the click clap of the outside rails and has reduced the wear on the wheels and pickup rollers or slide pickups as well as improving electrical conduction. I used used 027 gauge track of several manufactures as well as 28 Marx switches so gaps are normal.
Charlie
