Four goals in the last 12 minutes put the icing on the cake of a tremendous Rhydymwyn performance.
Anthony Wearden netted the only goal in the first half of this Vets League Cup tie, putting the visitors one-up after six minutes.
Michael Murray levelled for Isa on 76, but then Rhyd turned up the heat, Karl Bacon putting them back in front after 78.
Gavin Hughes then added a double and Daniel Jones a single to wrap up a 5-1 triumph.
Saturday’s only tie saw the Nomads rattle up nine at home to Brickfield.
Lee Cousins led the charge with a four-minute hat-trick, scoring on 45, 48 and 49 minutes.
Michael Ryan and Sam Dooley delivered a double apiece for the hosts, while Kevin Smart and Paul Whittaker bagged one each.
Darren Greenway scored both for Rangers, bringing them level at 2-2 in the first half before Nomads ran away with it after the turnaround.
The Park’s first-team joint-manager Tony Jones was in deadly form for the Vets, scoring four times in their demolition of Buckley.
Jones struck on 30, 45, 48 and 70 minutes, while there was a goal each for Jason Edwards, Alex Huxley, Darren Jones, Stephen Rees and Dave Evans.
Colin Cunningham pocketed a consolation for Bucks.
Gari Evans, Sam Roberts, Simon Pike, Warren Aykroyd-Duckett and Matthew Lowe all made the scoresheet as Ruthin advanced at the Dragons’ expense.
Carl Wilson’s 37th minute penalty was Deeside’s only contribution to the scoreboard.
The only close tie of the weekend saw White Bear edge out Mochdre on spot-kicks.
Ryan Davies’ pair on 37 and 44 minutes put the hosts two-up at half time, but Christopher Lloyd and Anthony Priestley hit back after 50 and 82 to force a shoot-out.
White Bear came out on top 5-4 and squeezed through to the next stage.
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