He eventually established himself as an outfield player and made his competitive debut in the old First Division as a substitute in a game at Sheffield Wednesday in 1966.
In 1966/67, Mackin scored five goals in 40 appearances and, the following season, he played 45 games and scored a further seven goals.
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Mackin made a scoring Southern League debut in the 3-2 loss at Banbury United and went on to net five times in 53 apperances as he was named the player of the year.
In the 1974/75 season, the right-back scored twice in 52 games and took over as club captain and then took over as caretaker player/manager from Mick Blick with the appointment made permanent in October 1975.
He held down that role until 1977 after four successful years with the Steelmen as a player and manager.
Mackin returned to local football briefly in 1978 when he took over as manager Cottingham.
In tribute, Corby said: “John Mackin, a local boy made good, is remembered with great affection here at Corby Town and we send our condolences to his family and friends at this sad time.”