Does not break! ? Strongest Pencil Sharpener
Japanese Style Pencil Sharpener 634
Does your lead break after sharpening?
It is caused by blurring and pushing too much or upward, or too dull in the blade, which makes the lead a lot of pressure.
And the wood part becomes thinner and the wick will break in the unprotected part.

One of the causes of shaking is because traditional pencil sharpeners have a gap in the opening of the sharpener compared to the tip.
Sharpen the pencil and then it will hold the tip of the pencil.
The red circles in the image represent a fulcrum, a little bit of shaking and the leverage is applied to the tip of the core, which causes the lead to breakage in a bit of thinner wood.
Because it folds in the tree, you will be suspected if it was broken from the beginning.
On the other hand, the 634 shares the shaft with one of the two built-in blades, then sharpen the core with the other blade.
In this way, the force required to get a lead is reduced by half and less shake.
In addition, since the pencil becomes thinner, the fulcrum of the lead is closer to the tip, reducing the force on the tip even if the pencil is shaking, resulting in less lead breakage in the axis.
This product is sold as a spare replacement blade set.