Campbell's shot bounced on the green and then plopped in.
"I didn't see it bounce, but everyone told me," he said.
"It's an easy game now when that happens."
It is the second ace for Campbell in 20-odd years, the previous being around five years ago on Castlecliff's ninth hole. "It's always good," he said, when asked which was more memorable.
His name will go on the honours board at the club again.
It is the sixth hole-in-one in the wider Wanganui region in 2015 and the fourth at Castlecliff.
Those Castlecliff aces this year have been Waitotara's Francis Hill (fourth hole) in February, followed in May by club captain Grant Clark (also fourth), veteran Geoff Russell (13th), and now Campbell.