More witnesses are being sought as police investigate an incident which saw a Hamilton man hit on the head with a large beer jug.

Trevor Cochrane was put into a coma and remains in a serious condition in hospital.

He was struck by the 2-litre super jug after he stepped into a drunken argument last Friday between one of his Dinsdale Drywall employees and another patron at the Still Working Bar in Chartwell over who had won an arm-wrestle.

The 55-year-old remains at Waikato Hospital's high dependency unit in a stable but serious condition.

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Police have arrested and charged a 23-year-old man with wounding with reckless disregard.

Detective Senior Sergeant Mark Greene of the Waikato CIB said Mr Cochrane's life and that of his family had changed in an instant, and he urged more witnesses to the incident to come forward.