Leading apprentice Kathy O'Hara has found a new weapon to combat any question marks over her riding style - toe-stoppers.

O'Hara elected to trial the toe-stoppers for the first time at Randwick on Wednesday after being fined $400 by stewards for disobeying an order to ride with at least the balls of her feet in the irons when successful aboard Superfreak at Canterbury last Wednesday.

She said the toe-stoppers would ensure she stayed on the right side of stewards in the future.

"I got a call from a man on Monday who read in the paper that I was warned about riding with my toes in the irons and this helps you stay on the ball of your foot," O'Hara said.

"You put the ball of your foot in and it can't move around so in the running you can't slip around.

"That's why I got in trouble before, I usually ride with the ball of my foot in the irons but it moved and this way that won't happen."

The toe-stoppers are like a small pouch riders slip the top of their feet into and they attach to the irons.

O'Hara said Damien Oliver wore them when riding Media Puzzle to victory in the 2002 Melbourne Cup but because they weigh close to 200 grams each they weren't suitable for jockeys who struggle with their weight.

She had success using them on Wednesday, landing a double via the Bernie Howlett-trained Darwina in the Sydney City Lexus Hcp (1100m) and Loftily for Allan Denham in the final race.

"They're pretty good and they give you confidence on a horse who's a bit fractious as well," O'Hara said.

It was also a good day at the office for jockey-turned-trainer Stephen "Beaver" Schofield who celebrated his first city winner with the boilover win of Cool Phantom in the Henry Lawson Hcp (1800m).

Cool Phantom had finished down the track at Cessnock and Kembla at his past two starts and wasn't expected to do much better on Wednesday with bookmakers offering as much as $91 before he started at $81.

While punters weren't happy to see him bob up Schofield was thrilled.

"It just shows you have to hang in there and keep battling away and your turn will come," Schofield said.

"This is great. It couldn't be much better either because I got 90-1 and had $100 each-way, although I cut myself a bit short because he paid $104 on the tote!"