ryobi cs30 weed eater assembly diagram?

Machine has a small spring coil intended to return the speed trigger back to a neutral position. In working on my weed eater this past weekend, the spring slipped out when I disassembled the housing while trying to tighten the accelerator cable. I cannot find where this spring was located in the assembly and could not figure out where to re-install it. Consequently, I have only one speed which I can set manually with a screwdriver.