A daily check of his weight in front of his boss may have saved the Australian career of apprentice Rory Hutchings.

Hutchings celebrated his first stakes success for his master Chris Waller at Hawkesbury on Saturday, only for the leading trainer to reveal how he has had to keep the 21-year-old focused on his job of riding for the high-profile stable.

"We make him weigh in every morning. Every morning he comes and weighs in in the office," Waller said.

"And by that time we get a chance to have a quick chat to him as well to make sure he is eating properly and doing everything right."

Amovatio ($13) was one of four Hawkesbury Gold Cup runners for Waller and the five-year-old found the best part of the track closest to the outside fence to finish over the top of Mighty Lucky ($6) to win by a half length.

Casino Dancer ($31) ran her best race of the autumn to finish third, a long neck further back.

A multiple champion apprentice in New Zealand, Hutchings has battled weight and suspension since linking with Waller.

Waller says Sydney racing can be an unforgiving environment for an out-of-sorts apprentice and Hutchings admitted he was close to quitting.

"I thought about (going back to New Zealand) a few times when suspensions and my weight were getting me a bit down," Hutchings said.

Amovatio's win was Hutchings' 21st city winner for the season and he has extended his Sydney apprentices' title lead over Winona Costin.

Waller said Amovatio had been hard to place and he devised a plan to have the gelding at his best for $200,000 race.

"He had a barrier trial but we also gave him a private jump-out with three of our other horses to make sure he was rock-hard fit," Waller said.

"It's very rare for our stable to have private jump-outs. It would probably be one every six months."

Godolphin's Furnaces earned a place in the provincial track's record books by clinging on to beat Inz'n'out in the Hawkesbury Gold Rush.

Helped by a furious tempo set by the outsider Sweet Serendipity, Furnaces posted an 1100m Hawkesbury record.

A well-tried favourite, Furnaces ($2.90) clipped more than a half second off the record despite having to navigate a less-than-conventional course to find better ground in the straight.