GRAFTON MAG-LITE CANTILEVER BRAKE
Grafton makes a reduced weight version of the Speed Controller they call the Mag-Lite. This version of the brake has several pieces changed to reduce weight including the arm, spring cap and back plate being made of magnesium, and the pad holder pieces are made of aluminum.
Mechanical explanation of the Mag-Lite. The Mag-Lite design is identical to the SC with some parts substituted. The aluminum Speed Controller arm with the brass bushing pressed into it weighs 21.5 grams, the magnesium Mag-Lite version weighs just 15 grams. The aluminum back plate and cap, which enclose the tension spring, weigh 6.5 grams in aluminum but just 4 grams in magnesium. The Mag-Lite's pad holder is made of Titanium and weigh 5 grams. The inexpensive steel washers of the SC which weigh 10 grams, have been replaced with aluminum and thin steel versions weighing 4 grams. The 2 gram steel tightening nut in the SC had a 4.81mm thickness, and is replaced by a 1.5 gram steel nut of the same type but is just 3.2mm thick which accounts fopr the weight reduction. The straddle cable is still made by Dia-Compe and is slightly lighter, but just 300mm long. The same 8 gram cable carrier is used here.
The final way used to drop weight on the bike is done by providing aluminum mounting bolts. These aluminum bolts aren't intended to tighten the brake on, a separate pair of the original steel bolts is also included. The idea is to use the steel set to tighten the brake down, then back them off and replace them with the light aluminum ones to hold it down. End of Mechanical.
On the side of misfortune, for all the efforts to make this brake lighter, and its considerably added expense, it is still shipped with the same Black Dia-Compe pads weighing 51.5 grams a pair. Because this brake is the mechanically the same as the SC it also has a Bike-Pro brake profile measurement of 33mm. The Mag-Lite weighs 132 grams (with the brake pads). To this add 5 grams for the aluminum mounting bolts and 8 grams for the cable carrier for a total weight of 145 grams. The Mag-Lite is made in Black only.