Which hard pen calligrapher made a big hard pen and wrote big characters like China's calligraphy?

Zhu Xingguo, a hard pen calligrapher, made a big hard pen and wrote big characters like calligraphy. In the past, people thought that hard pen could not write big characters and become a great instrument. Zhu Xingguo doesn't believe it. He believes that the quality of calligraphy works is not whether it is a soft pen or a hard pen. Although compared with soft pen, hard pen has the weakness of thin and monotonous strokes, it is not insurmountable. So, Zhu Xingguo made a hard pen himself, which can write a foot square. He also made bold innovations in the pen method, creating his own oblique front method and spiral front method, which greatly enriched the expressive force of hard pen writing. The wonder of Zhu Xingguo's calligraphy lies in the originality of writing tools. His calligraphy works not only won prizes in provincial exhibitions for many times, but also spread at home and abroad, and were given to foreign friends as gifts for many times, and were praised as the first person with hard pen and big characters in China.