Put under the knife fully closed, then screw the top portion out until it barely touches your knife, a rubber stop is optional.

PS: the “mini knife holder” can be used for chefs knives as well, the advantage being that you can draw out and angle your knife differently when you reach the tip to avoid sharpening the tip at a very low angle. be sure to cover the touching surfaces with some sort of tape (Kapton/Electrical) to avoid scratching your knife!

PS: Clamp your knife slightly loser as the sharpener tends to hold each side at a different angel when rotating, this way the knife can be nudged upwards on the side that's closer, and if it's further away you can push it up further. OR you can clamp the knife tightly, and use one color for each side and swap them (Like white and black)

I much prefer leaving my knife slightly loosely in the clamp instead as this way, the sharpening angle stays the same on both ends too.

measure your angle AFTER putting this under.

keep unscrewing the top until it just barely touches your knife, you can keep tapping it to see when it stops making a sound, or lower the clamp force and just slightly push the knife's surface up.