The next four ends belonged to the Vaotuua pair and on the ninth end they were only one point behind.
The Shanks pair scored one point on each of the next three ends to take a 10-6 lead on the 12th end.
However, Vaotuua and Richter got their mojo going to wrap up the game at 16-11 on the 18th end. They will play in the centre's champion of champions mixed pairs on May 1 and 2.
The Thursday Aggregate, sponsored by the Kahutia club's “Sunday boys”, concluded on November 5.
Nona Aston, with 16 points, took the spoils from Mo Kapua, with 14 points.
Murray Murton and Ray Young were in equal-third place, each having 13 points.
The November series, sponsored by Farm Meats, begins this week.