And make sure that the 3 arms of the 3 armed thingy (yeah awseome technical term there Bob) slide in and out freely in the slots in the body. If the dont sand paper or file them till they are a nice slidey fit.

If the springs have to push against any rubbing friction the carb wont owrk propperly. Ive had quite a few ive pulled apart where the 3 leg thingy has been binding up.