... 5X12/13Code No.99-011For ModelC-16,F-20,F-20A,HUS,2,3,4,5,HUS ... used such as long time,low spark.Products manufactured by automatic carbon brush machines, characteristics as follows: 1 ... manufactured per buyer's drawing or sample.Information for your reference Carbon brush performanceCommutator: Unit must be ... should be set to the original manufacturer's specification. Any more than a 2 degree variation in ...