I am a ten-year student of Chinese calligraphy and am thinking of creating a calligraphy piece that would mean "dedicated craftsman". I have not been able to find such a phrase in idioms or chengyu sources that I have.
Can someone suggest a short phrase (no more than five or six characters, not a sentence), that would work for this idea? This piece will be given to a professional film editor who refers to himself as a “dedicated craftsman”. He means that he has high standards for the quality of his work. He is not a hobbyist.
Thanks for help.