From: Sandy Bay
Signed by Melbourne in 1954 after transferring from Tasmania to Puckapunyal on army duties but didn't play a game. The VFL initially cleared him by accident to Mildura Imperials, despite him not applying to join them.
He wore number 27 that year.
Sandringham beat Box Hill for McMahon's signature in 1955, and got 27 games over two years out of him before he was transferred back to Hobart on army duties.