Andy Stewart admits owning Big Buck's has become a "nervous responsibility" as his bids to win the Ladbrokes World Hurdle for a fourth time.
The Paul Nicholls-trained nine-year-old would move ahead of Inglis Drever in the record books as the only four-time winner of the race should he triumph on Thursday week.
Big Buck's has not lost over hurdles since Nicholls switched him back to the smaller obstacles following a mishap in the 2008 Hennessy Gold Cup, a move which Stewart disagreed with at the time.
"(It was) a mad idea hatched by the genius trainer Paul Nicholls. Many of us said he was bonkers," said Stewart.
"The first of his 15 wins over the smaller obstacles was on New Year's Day in 2009 at Cheltenham when he beat Don't Push It, who has since gone on to win the Grand National under AP McCoy.
"Owning the horse has become a nervous responsibility. Our family are so lucky and the numerous messages and letters that we receive overwhelms us.
"Who knows if he will win for a 16th time in a row - but win, lose or draw, he will always be a very special horse to us."