Push the edge of burin forward and shovel some wood-fiber. Then, pick
up and peel the wood-fiber out of the tree to complete Si-Diao process.
When using Burin A, hold the burin shank firmly on one hand and push
the burin by another thumb (Fig. 1). After making an indentation,
lift the burin up and raise some wood-fiber (Fig. 2). Then, clamp
the lifted fiber by thumb in order to peel the fiber along the grain
of the wood (Figs. 3~4). The clamping and peeling process also
can be done by sharp-nosed pliers.