After Pencil Revolution’s Wopex post and the following discussion on how to sharpen a Wopex: a photo of a Deli 0668 sharpened Wopex.
For many months now I have hardly ever sharpened my Wopeces with anything other than a Deli 0668. For that purpose I have one Deli 0668 at home and one in the office. The 0668’s angle of 20° is more suitable for the Wopex than the more acute angle of ~17°-18° the Deli 0635 will produce.
One warning though, the hardness of the Wopex can make the auto-stop fail. If you notice that the sharpener doesn’t stop, release the pencil holder (back to it’s original position) to avoid more of the pencil being fed further towards the burr cylinder. To finish the sharpening process just keep turning the handle until there is no more resistance .