So what's the secret to the success of Boneheads?

Team manager Terry Walsh believes the team's success is built around one ingredient - friendship.

Boneheads, Terry said, has returned home to Sydney with the silverware from Cootamundra on "three or four occasions".

And a lot of the original team members from nearly three decades ago when the team first took part are still running around.

"A lot of us are getting on now," Terry said.

"Some of us are in our fifties and sixties, we're now life long friends".

Terry hand picked his first team from players he knew in a competition he ran in Castle Hill and many of them are still putting their hand up to play each year.

"It all started when I was invited to come down and compete.

"I just knew a lot of people and hand picked a team.

"We now just keep coming and have a good time, a lot of fun."

Despite their age Boneheads surprised a lot of their opponents with their skill and speed.

"One team came off earlier in the carnival when we beat them and said we must've been awesome 25 years ago," Terry joked when talking of the team's latest win.

In the carnival's decider Boneheads defeated Wagga One in a close game requiring a drop off 9-8.

"We were down to our three best players," Terry said.

And who are the team's stars?

"If you ask any of the team they'll all tell you they are," he said.

As for next year "of course we'll be back," Terry said.

"We stay at the Coota Gardens each year and spend in the town to help the community".

In the Division Two grand final One More Year defeated Full Biccy 9-5.

Cookie Monsters took out the Division 3 grand final defeating Touchie Taggers 4-2.

Carnival organiser Tisha McTavish thanked the Cootamundra-Gundagai Council for presenting the grounds for the carnival in excellent condition.

"They have dealt with extremely challenging conditions to get our fields prepared for the carnival and have done a fantastic job," Ms McTavish said.