Traditional Culture Encyclopedia - Traditional festivals - Is the main feather of the brush arrow vertical or vertical?

Is the main feather of the brush arrow vertical or vertical?

Some people bought arrows.

The tail of the arrow needs to turn.

Adjust the direction, the notch of the arrow tail is up and down, that is, the direction of the main feather groove is equally divided, and then the main feather is up. . . The arrow feather just came out of three gaps in the brush. . But I haven't used the heald arrow watch. . By the way, the heald cake arrow table

It's just a hole. . How did the arrow feather get through?