"I was just able to push the pain aside and focus on completing it. I kept thinking, 'Just grit your teeth and carry on.' The big thing for me was having us all complete what we started - I don't like to leave things unfinished."
Clapham was roped into one of the Trade Night teams. As the lightest of the lads, he was nominated to complete the run leg. The bug bit deep and he returned with Trade Night in 2015. Firmly hooked, Clapham will take on the Full Monty solo multisport at this year's event: 33km of road cycling, a 10km kayak, 10km trail run and 21km mountain bike, finishing with the 2km run that so aggrieved Pennell.
Clapham confesses signing up for the Full Monty wasn't entirely his idea.
"Bularangi Holiday Rentals offered to pay the entry fee and my Trade Night buddies had the entry form ready after I'd had a few beers. One day I wasn't doing it; the next, I was fully committed," he smiles.
Despite the inauspicious entry, Clapham has targeted a time of under five hours to complete the 78km course, relying on fitness and local knowledge to get him over the line.
"I'm a really active guy, I hardly ever sit down and I'm busy all the time. And I know the area pretty well as I've lived here most of my life."
A top-10 age-group finish could be within Clapham's reach if recent form is anything to go by. He completed a training run over the arduous 10km coastal section in under an hour.
The Nugget Multisport course has been touted as one of the most picturesque in the country. Quiet country roads take competitors out to the spectacular harbour and glistening Waihi Beach. A remote rocky coastal path dips into Orokawa and Homunga Bays before turning on to private farmland and single-track.
With a carnival atmosphere at the finish, competitors run the pit rim of cavernous Martha Mine to break the tape in the shadow of Waihi's historic Cornish Pumphouse.
Clapham has only recently begun training on the mountain bike and kayak but is confident his mind will be firmly on the job, insisting the environment is a boost rather than a distraction.
"When you're out there exercising in such a stunning environment, you hardly notice any discomfort.
"It's pure pleasure. I'm pretty confident that I can complete the race, but I guess I'll be winging it a bit on the day."
Nugget Festival
What: Multisport race, duathlon and trail walk/runs
When: Next Saturday, May 7
Where: Waihi, Southern Coromandel
For more information: www.thenugget.co.nz