With plug thread M12 x 1.25. Harley Davidson FLSTN 1584 Softail Deluxe FS2 2007. Harley Davidson FLSTN 1584 Softail Deluxe FS2 2008. Harley Davidson FLSTN 1584 Softail Deluxe ABS FS2 2011. Turn the piston slowly against the stopper, then loosen the nut with slowly increasing force.
