2006 Honda TRX680 Rincon Factory Service Manual, Page 264Get this manual
SUB-TRANSMISSIONGEARSHIFT LINKAGE GEARSHIFT SPINDLE Check the shifter gear and splines for abnormal wear or damage
INSTALLATION
Apply locking agent to the pivot bolt threadsInstall the spring, washer (between the crankcase and arm) and stopper arm with the bolt as shown and tighten the bolt