The Magpies saw Ryan Upward sent off for a second yellow card seven minutes before half-time and the visitors took full advantage with Jake Hyde scoring soon after and King doubling the lead on the hour mark.
The slight compensation for their manager Daryl McMahon is that with his side’s latest victory, their seventh in eight games, they may well also have dashed Halifax Town’s hopes of making the top seven too.
The defeat sees the Shaymen – who saw Danny Williams sent off in the second half – stay in fifth place in the National League table but the gap has tightened up below with Wrexham, Notts County and Chesterfield all winning.
The 31-year-old –a high-profile signing from Fleetwood Town last month – played his most vital role yet as his solitary goal continued Stockport’s title push at the expense of play-off chasing FC Halifax Town.
A penalty from the National League’s top scorer Michael Cheek – his 20th goal of the season – and a stoppage time second from substitute James Alabi ensured Neill Byrne’s goal back with almost the last kick of the game was mere consolation.