A timely five-wicket haul from captain John Kedey has guided ACL to a resurgent 21-run win on Saturday.
Trevallyn had looked to be on track towards victory at 3-111 in the 22nd over, needing 51 more in the 32-over game after an hour was lost to rain.
Kedey soon after removed the dangerous Nick Garwood (12) leg before and the hosts collapsed to 6-10 off 27 balls.
The offspinner took all but one of the final six scalps for a superb 5-13 off 6.2 overs.
Rival skipper James Whiteley (29) and Charles Von Stieglitz (20) earlier put on 46 for the opening wicket, but their start came to nothing as Trevallyn was outed for 140.
Danny Bennett (43) and Chathura Athukorala (36) all but single-handedly guided ACL to 7-161 during a 57-run stand for the third wicket.
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Hadspen snuck home to claim victory with seven balls to spare against Perth under Duckworth-Lewis method.
Captain John Hayes with 56 off 67 balls and ex-coach Matt Lawrence with 40 off 46 pushed Perth out to 7-151.
The Demons began on fire when Andrew Rigby caught and bowled flag hero Thanuka Dabare off the first ball.
But Jona Watts added 33 off 34 balls to his four wickets while Liam Reynolds played a steady hand for 34 off 54 to secure the seven-wicket win.
Beaconsfield were 1-83 off 22 overs with Longford when the inclement weather forced the match to be abandoned.
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