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Dunedin Bunnings workers protest during a two-hour strike in Dunedin on Saturday.
About 20 workers joined staff at other stores around the country in opposing a company proposal to introduce flexible start and finish times.
First Union southern region secretary Paul Watson said workers were opposed to the idea of start times up to three hours before or after usual start times any day of the week.
Negotiations which began some weeks ago had stalled.
The union was waiting for the company's response.