It would be best to ride down to your local Schwinn Dealer and buy a new driver, just like you did in the good ole days.
Obviously new parts are not as plentiful today as they were 50 plus years ago. Wash all of the grease out of the driver, gears, and pins, DO NOT USE BRAKE CLEAN for this operation. Take a six pack of beer over to your local car guy buddy and have him TIG weld a tack weld on the end of the pin away from the bearing surface. It will take him all of 30 seconds. The reason you were told to NOT USE BRAKE CLEAN is because it will give off a lethal gas during the welding process. Acetone is fine, it has to be squeaky clean to TIG. The TIG welding will not splatter like a MIG weld does.
John