Hey I have a question. I thought I read a thread here about a way to adjust the non adjustable carbs on echos. I was thinking that there was a adjustment right in the center of the throttle shaft that you had to have a special tool to adjust it with. Does anyone know what I am talking about. If so what is the part number of the tool? I looked at one and there is a funny shape down in the center of the throttle shaft that looks like it could be a adjustment of some kind. I have a few trimmers that could stand to be fattened up just a tad.