Leading Queensland jockey Michael Cahill has a better idea than most of what it takes to win Thursday's Lismore Cup. .

Defending champion Hawks Bay heads the weights for the $185,000 Darwin Cup (2000m) on August 6 with a crushing 64kg adding to the challenge he faces to become the fourth dual winner in 50 years.

Sydney's new champion trainer elect Chris Waller will be seeking his first success at the Grafton July Racing Carnival when he tackles next Thursday's $150,000 Wykes Tyrepower Grafton Cup with his in-form stayer The Verminator.