It was not long after Mr Edge and his brother Ross, who died last year, got the surfing bug that they started making boards, taking their design from pictures in magazines.
"Between the two of us we came up with a concept of what we thought looked like a surfboard," he said. "We made a concrete mould, bought a two-pack of foam mix, poured it in and crossed our fingers.
"We made the blank, cut it in half, put the stringer down the middle, stuck it back together, glassed it over and stuck a fin on."
Mr Edge makes it sound easy but this old surfer, like generations who have followed since he and his brother pioneered the activity at Whangarei beaches, well knows how important the nuances of a board's design and shape are.
He reckons the brothers got it pretty right back in the early 60s in their backyard, with their gung-ho, can-do experimentation. Today's popular "fish" boards are not too dissimilar in shape to those innovative backyard long boards.
Mr Cunningham is hoping for a good turn-out next Sunday at the event which attracts surfers and board shapers from all around New Zealand and from overseas.
"One thing that really blows me away is how much surf history there is in Northland."
That history includes the old surfers themselves, as well as many boards people bring along which hark back to former generations' surf days.
"Quite a few of them in the past two years literally got pulled out from under someone's house — their uncle's or grandfather's old board, for instance. They're not flash, they might be nothing to look at or even ride."