My father was left handed. While in school, before WWII, he was beaten on the offending hand, to discourage him from writing with the left hand. So eventually

My father was left handed. While in school, before WWII, he was beaten on the offending hand, to discourage him from writing with the left hand. So eventually he became accustomed to write with the right hand, and then he has continued to write with the right hand, even if he always did most other kinds of precision work with his left hand.