to install my alternators type of brush assembly, all I did was cut a strip of thin cardboard from a notepad and used it to hold the spring loaded brushes down into the case as I slipped the assembly over the rotor shaft and seated it into position..often the assembly 'spring case' has a small hole for this procedure..where you can use a toothpick or red tube that often comes with a can of wd-40, to hold the bruches in place...