07-15-2011, 09:33 PM
Another tip for filing the "solder lumps," use a "draw filing" method. That is using a fine jeweler's file, put the file 90 degrees to the rail, and then slide it back and forth along the rail, not across the rail. Think of the rail as the grain in wood and file with the "grain" not across the "grain." You will end up with a much finer, smoother, surface on top of the rail with fewer scratches.