On their latest visit to Whanganui Ben and Aimee Bonne went straight from the airport to the top of Durie Hill Tower, to leave another padlock fastened to the railings.
It's become a tradition for the Auckland brother and sister, aged 16 and 14, to get off an Air Chathams flight only to climb the tower's 176 steps and leave a padlock engraved with family initials behind.
On their first trip they saw a lot of padlocks hanging off the railings. That's when they decided to add their own.
"We always put a lock up there, to leave our great memories up there. It's like bonding our love.
"We get our initials engraved at the jewellers, with the date."