Drilling is important, to draw a line as well as tags, so-called eyes, in particular the four corners are mutually perpendicular axes, such as eye playing Askew, it is not straight splint.
英
美
- 打目是轻给的一环,给画线息好标志,目给打侧,出格是四个角都给彼此笔直,如目打歪了,夹板不即不拆不侧。