W&H S-11 L G Instructions For Use Manual page 19

To change rotary instrument
Unlock and swivel the chuck lever.

Insert the rotary instrument until back stop.

When using a locking pin:
Insert the rotary instrument until back stop
and turn until the locking pin engages.
Return the chuck lever to the initial position.

Check secure location by applying slight axial

tension.
or
Unlock and swivel the chuck lever.

Remove the rotary instrument.

19