the coffe grinder i use is an antique hand grinder, but i cant seem to get it to grind the beans coarse enough (because i use a french press, so i need the grounds really coarse), it grinds them finer than regular coffe grounds in a can. i tried adjusting it but i think im just making the crank looser. does anyone anything about these kinds of grinders? or is there another way to grind coffe? or should i just shell out 20 bucks and get an electric one?