 Following Ashwin's death in 1909, Radecki became chief designer for J. Ashwin & Co, in partnership with Frederick's brother John; he was proprietor of the company from John Ashwin's death in 1920 until 1954.The largest glassmaking establishment in Sydney, with a high reputation, the firm created the chapel windows for St Scholastica's Convent, Glebe, in the early 1930s.Radecki's work included windows in such churches as St John the Evangelist's, Campbelltown, St Patrick's, Kogarah, St Joseph's, Rockdale, St Matthew's, Manly, and Our Lady of Dolours', North Goulburn, Scots Kirk, Hamilton, Newcastle, and the Presbyterian Church, Wollongong.