Hi Byomarimba,
Plt3043YW doesn't have a clutch. Only PLT3043E and PLT3043YE have the clutch. Plt3043YW is straight connection to the head through coil shaft or linkagage. The coil shaft is square on both ends and can pull out easily when the whole shaft assembly is disconnected from the motor with four bolts holding it. Inside the bend yellow pipe has a long clear plastic guide with the coil shaft in the middle. The end of the shaft towards the head is inserted into the head spindle. The head spindle has threaded female end for the head to mount and a square slot inside for the coil shaft. The spindle is force fit and crimp to the end of the bend pipe. If the end of the coil shaft is rounded, the linkage will slip and clicking can be heard. Pull the shaft and inspect both ends if rounded. If rounded, cut the rounded end and make a new square end with angle grinder. Doing so, you also need to cut the pipe accordingly. Dismantle the handle and make a new guide hole to line-up with handle guide. It's also easy to remove and replace the spindle or undo hard to remove bump knob. Hope it helps.
Cheers,
TheCarbyMaster
