Dean gave Stones, semi-finalists last season, a ninth-minute lead which they held until the stroke of half-time, when Sam Ives levelled it.
Another goal from Dean restored Wealdstone's advantage in the 68th minute but Carl Piergianni made it 2-2 in the 82nd minute and Josh Moreman grabbed the late decider which, in truth, Corby deserved, having had the upper hand for much of the night.
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