Re: Bike Bobber
Cupping the Brake Flange
Cupping the brake flange is critical. Without this the arm will simply twist and brake off of the flange. I cut out a small rectangle from the left over piece's of box tubing leaving the 1/8 radius. I slit the radius about every 1/4 in. and eyeballed it into position centered on the edge of the flange. As I tacked it together I tapped the heated metal around the flange with a hammer to form a cup. After tweaking the cup walls straight I finished welded both sides and than rough ground them.