I pulled fly wheel and there is another pressed nor threaded lock on the cranck shaft, normaly the forces and johnsons I work on have the key between the flywheel and crank, but this key islocated between crank and some sort of coupler when I pull the schematics up this part does not show up. should it be pulled, it cant be uncrewed it would just turn the crank. advice please i need to replace trigger. thanks in advanced.

