Mr Clarke's journey in handiwork began in 1947, at age 16, as a blacksmith's apprenticeship at Masson Implement Company -- where he was to work for over four decades.
"I walked in, and asked, 'how about a job?'"
"You started from the bottom: I was known as 'the boy', and didn't call by bosses by their Christian names until I was in my 30s."
It was at Massons that Mr Clarke learned wheelwrighting -- making carriage wheels from wood and fire-forged metal.
"All that stuff was going out of fashion -- but the chap who taught us said it might be useful one day. Really, the Surrey is a tribute to those old guys, and their skills."
In 1969, Mr Clarke become well-known in Carterton when he began fixing the town's clock, employed by then mayor Ron Wakelin.
"I was fixing Ron's printing machines, and he said, 'Son, you're going to look after my clock.' I earned $87 a year -- I think the paper boy made more. We had a few disasters with the clock -- but it still works."
Mr Clarke later served as a district councillor from 1971 to 1989, and was deputy mayor in 1988.
He played rugby for Carterton, led fundraising drives for the Carterton School hall, built wooden horses to raffle for Ronald McDonald house, and helped build the Matador Motel "in [his] spare time".
Mr Clarke continued wheelwrighting as a hobby after retiring in the early 90s, beginning work on the Surrey in 2013.
Since then, the carriage has carried Mayor John Booth at the 140th anniversary of St Mark's Church, World War II veterans at Carterton's Anzac Day parade -- and everyone from children to rest home residents.
Any money he receives for rides will go into a charitable trust.
"I never wanted it to be a money-making venture -- I just enjoy creating things, and seeing the smiles on people's faces."
Though he turns 84 in September, Mr Clarke is showing no signs of slowing, making carriages and pony gigs for happy customers.
"I'm happiest when I'm in my overalls. I can't sit still for very long -- I just fall asleep otherwise."