Bull has Regal Rock in race three and Can't Explain It in the sixth on the eight-event program.

Regal Rock returned to form with a win two weeks ago at Newcastle, fighting back to beat Roll With Lachlan by 3.8 metres in a 1:56.8 mile rate over 2030m.

The former Queensland-based gelding announced himself as a potential city class pacer with a mile win in 1:53.9 at Newcastle last July but his form since has been patchy.

Bull believed gear changes and Jones had helped get Regal Rock back firing.

"We've had a lot of problems with him," Bull said.

"He lost half the sole of his wall on one foot and it took us a while to get that right, and he's also been really sore.

"Tony went over him before he won, and I said he'd run second the week before, and Tony said he was surprised the horse could do anything. He did it on three legs.

"He said he should be right now, and he was. They ran quick time and he got hammered in front as well, so I think we've got him back to right now."

Can Explain It, winless since July, was second last start at Newcastle and Bull expected another strong effort.

"Tony went over him because he'd been going ordinary and he said he was sore too, and worse than Rocky," he said.

"He came out and led and ran second, and that was his best run in a long time."

"Tony's gone over him again and he's right now, so I'm hoping the two of them go well."