How do you set carb on craftsman weedwacker 3587958?

Remove the adjuster screws limiter caps if they are equipped with them. turn both screws clockwise until they gently stop and turn them out ccw 2 turns. Start engine and let it warm up for a few minutes, turn idle screw cw a little to elevate engine idle a little. Find the screw with an L next to it on the carburetor body, turn it ccw until the engine starts to stumble and then turn it cw until it stumbles again, then set it half way between those 2 points. you will need to adjust the idle until the cutter head stops moving. for the H adjustment hold the throttle wide open and do the same as you did to the L adjuster screw.