Daniel Stackhouse, the leading South Island apprentice, has commitments at Paeroa on Wednesday, ruling out riding at the rescheduled Oamaru meeting the same day.
Stackhouse has been engaged for Myths and Legends in the Inter-Island Steeplechase at Paeroa.
Myths and Legends won an open steeplechase at Te Aroha on June 25 with Richard Eynon the rider.
Eynon has the mount on Volkswagin in the Inter-Island.
The John Wheeler-trained Volkswagin has been campaigning in Australia.
Volkswagin finished third to Al Garhood and Mali Juraj in the Grand Annual Steeplechase at Warrnambool on May 6.
Stackhouse, who has ridden 34 winners this season, has mounts at Wanganui on Thursday.
His absence from Oamaru has led to a new rider for Eel Win, who is resuming in the open 1200m.
Robert Hannam has been engaged for the topweight.
Don't Say Clang is an addition to the field.
Trainer Terri Rae had planned to start him over 1400m at Oamaru on Sunday.
Royal Flight will now bypass the race on Wednesday in favour of a start over 1400m on Sunday.
Opie Bosson leads the New Zealand Jockeys' Premiership with 158 wins beginning the final week of the season.
Bosson had two wins at New Plymouth on Saturday.
James McDonald, who resumed in New Zealand at Ruakaka on Saturday, rode two winners, taking his tally to 147.
