i was just wondering if the drain screw for the carb bowl is a special type of screw? can i just put in a set screw with matching threads? i have not gotten the screw out yet so im not really sure what it looks. all the diagrams i see are not good for viewing finer details. i cant imagine why it was put in that tight in the first place, its almost like the screw has thread locker on it. the material the screw is made out of seems to be very soft and stripped with the first turn, are they aluminum?