The duo were somewhat surprisingly allowed to leave league rivals Walthamstow recently after guiding them to the Essex Senior League title last season, earning promotion to the Southern League.
Spillane has vast experience having won the Essex Senior League twice and managed at the likes of Aveley, Maldon & Tiptree, Thamesmead Town, Stanway Rovers, Redbridge and Stansted.
Mackie is the former Leyton Orient, Brentford, Reading and Sutton United player, who had been assistant manager at Potters Bar Town before joining Spillane at Stow.
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