I'm attempting to figure out where the "hidden" adjuster screw is on the Echo SRM 260 Trimmer. The 3rd post in this thread says this; "Most of my echos have a little screw on the back side of the carb its covered up with a plastic insert, now take a little screw and start it to pull the plastic insert out and the flat head screw is there, stick your screw driver in and run the machine wide open and adjust left or right till it runs good I have to do this to all mine. " I'm trying to figure out where this "back side of the carb" is located!??? Logically speaking the "front side of the carb would be the side facing the engine and the back side would be the side where the aircleaner/choke assembly bolts on. Now it makes no sense to me that one would have to take that aircleaner/choke assembly off to access this "magical" adjuster screw WHILE the machine is running!!???? Any ideas or pictures or ??? that can help me better comprehend this adjuster screw location!?? Many thanks in advance if you can share some of your tech knowledge on this subject!!!