Assembling and dismantling the
Make sure the knob is loose.
Align the cut-out in the upper shaft with the coupling's lock
plate on the lower shaft. The parts then lock together.
Tighten the knob.
Undo the knob (at least three turns).
Push the knob towards the coupling.
Carefully twist the upper shaft to unlock it.
Hold both parts of the shaft and pull the upper shaft out of