Spring fell out of throttle switch on Troy-Bilt trimmer ?

It's really not hard to put back on. It slips over the right side of the trigger. Put the trigger on the red post in the handle, then slip the circular part of the spring over the round part of the trigger with the little "tail" of the circular end of the spring catching on the straight part of the trigger. The other end of the spring goes in the slot on black safety switch part of the trigger.