Derwent Super Point Mini Manual Pencil Sharpener

Twist the handle of the crank anticlockwise. As you turn it the handle should become loose. Once released, gently pull the handle out of the sharpener.
Whe fully removed, clear the blade of any debris that has collected in the helical blade.
Check the hollow down the centre of the helical blade as this may also contain loose debris. If you look down the hollow in the blade you should be able to see through a small hole at the bottom.
Once the blade is free of loose debris reassemble the sharpener. The blade should slot back into the body of the sharpener and lock into position once turned clockwise.
You can also see the cleaning process in
this video
.