McCulloch Trimmac 210 problem
 

The throttle lever on my trimmac suddenly failed to accelerate the engine, but I could do it by manually opening the throttle on the carburetter.
I've taken the housing off the throttle lever and can't see anything broken but I can't get it back together. Does anyone know how to do that or where I can get hold of a repair manual ? I have the operators instruction manual but that is no help and I can't find any more information on line..
Help would be much appreciated !