Despite living in different cities, Signal and Gardiner, a 56-year-old prison officer with the build of a rugby prop, have played together at several New Zealand tournaments for the past six years and have an easy rapport.
Signal, 29, has been in national training squads but so far his only international honours have been with the national under-25 side. In the semifinals the pair will meet the Auckland father-and-son combination of Jamie and Neville Hill.
The other semifinalists will be Bay of Plenty's experienced Steve Beel, who was in the Girvan-skipped four which won the national title in Auckland in 2005, and his partner, West Coaster Shane Pascoe, and James Pugh, from Stoke in Nelson, and Henderson's Kerry Dye.
A notable feat yesterday came from North Harbour's Browns Bay club, which had four pairs, Tony Marinkovich and Brian Wilson, John Walker and Colin Rogan, Bruce Shand and Neil McMaster, and Ian Pyke and Richard Kimber in the last 16.
Only Marinkovich and Wilson, and Shand and McMaster made the quarter-finals, where they were well beaten by the Hills and by Beel and Pascoe.