Captain Danny Sullivan produced a stunning 84th minute winner to secure three points for Holywell at the Bartons North Wales Stadium.
The Wellmen took a third-minute lead when new signing Zak Kempster-Down set himself for a volley inside the box which flew into the net.
The hosts should have been further ahead at the break and paid the price five minutes into the second half when Owen Cassidy equalised for the visitors.
Only a magnificent save from John Danby denied Mountain the lead before with six minutes left, Sullivan burst into the box and hit a right-foot screamer worthy of winning any game.
Last season he was a 30-goal star for the Wingmakers and he has started the current campaign on fire – all hail Airbus hat-trick hero George Peers.
With 19 minutes played, the Wingmakers had the opening goal. A cross from Kieran Evans was not cleared and Peers arrived at the back post to find the net.
In first half added time, Buckley’s Bradley Knight hit a free kick which was saved by Keighan Jones to deny the hosts an equaliser.
Seven minutes into the second half Airbus doubled their lead through that man Peers. Some great work by new recruit Mason Blackwell-Jones saw him play the ball into Peers, whose shot was too powerful for keeper Ryan Goldston.
Knight had a brilliant chance to get Buckley back into the game when he found himself free at the rear stick, but his first-time effort went wide.
Sub James Davies hit the post before the Wingmakers made it 3-0 with 68 on the clock.
Davies picked the ball up in space and was able to find Sam Rickett with an overlapping run. Rickett pulled the ball back to Peers, who slotted home.
First half goals from Rhys Tilsley, Sam Flory and Iwan Matthews proved sufficient to bank the points for Guilsfield.
Jake Roberts also struck in the first half for Gresford, who missed a penalty after the break when Haci Ozlu’s effort came back off the post.
All-square at Alyn Park, Morgan Roberts and Cynan Edwards on target for Mold, while Daniel Owen and Owain James replied for the visitors.
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