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Maidstone regained top spot in the Ryman League Premier Division with a 1-0 win at Canvey Island on Tuesday night.
United struggled to find any rhythm but took the points with a Zac Attwood goal five minutes before half-time.
Stones lead AFC Hornchurch on goal difference following the victory, both teams with 30 points from 13 games.
United are in FA Cup third qualifying round action on Saturday, with Skrill South Boreham Wood the opponents at the Gallagher Stadium.