In 1945, Siddons began working for one of his father's firms, Siddons Drop Forging Pty Ltd,
drop forging hammers at its factory in
Clifton Hill. He was groomed to take over the business and worked across all departments of his father's conglomerate, starting at factory level to gain an understanding of manual labour. Siddons was sent to the United States on a research tour in 1949, where he was introduced to the newly created
Ramset gun – "a powder-actuated tool gun that greatly sped up the process of fastening slabs of concrete or steel". He acquired the Australian franchise rights and in 1952 incorporated Ramset Fasteners (Australia) Pty Ltd as a division of Siddons Drop Forging, with himself as general manager. Due to import restrictions the firm had to manufacture Ramset guns in Australia, quickly ramping up production and later establishing subsidiaries in New Zealand and South Africa. By 1955 profits from the Ramset line had surpassed the rest of the Siddons' tool-making divisions. ==Politics==