But while their hands failed them, Tasman first-five Marty Banks continued to tick the scoreboard over with his reliable right boot as they went to the break with a 16-3 advantage.
Veteran halfback Jimmy Cowan continued to show there is still life left in his legs as he provided a steady hand during his stint on the field, while Tasman flanker Shane Christie leads from the front with his tireless work ethic.
But whatever was in the water on offer at the interval, it temporarily sucked the life out of a Tasman side who lost their direction and ability to hold on to the ball during the second spell.
Waikato slowly eroded the deficit in front of them as they grew in confidence and Tasman did their best to lose the game by continuing to force offloads and passes that weren't on.
Tasman are a side who like to throw the ball around and use the width of the paddock but Waikato's improved defence was tricky to break through.
With only a few minutes left it looked like Tasman would pick up their second-straight draw but their final drive to the line showed what they could do when the secure the ball.
They showed impressive patience during the final moments and were eventually rewarded as Halanukonuka burrowed over and celebrated in due style.
The Mooloos brought plenty of endeavour to Trafalgar Park and they didn't die wondering but eventually it was Tasman who were able to find a killer blow.
The result pushed Tasman firmly in to playoff contention and they will host Taranaki in Nelson next week, while Waikato have a home outing against Counties Manukau in the next round.
Impatience is a virtue: Has a rugby team ever pushed more passes that didn't need to be thrown than Tasman? Their coaching duo of Kieran Keane and Leon MacDonald must have been tearing their hair out here.
Thanks for coming back: Fullback Robbie Malneek returned to the ITM Cup with a bang for Tasman. His scything runs were a catalyst for the Mako's victory.
Tasman 23 (Robbie Malneek, Siua Halanukonuka tries; Marty Banks 3 pen, 2 con)
Waikato 16 (Declan O'Donnell try; Damian McKenzie 3 pen, con) halftime: 16-3