One of my cupboard doors has had a loose hinge for a while, I'd done a quick 'botch' repair by unscrewing where the hinge was attached to the carcess of the cupboard and packing the hole with match sticks and screwing it back in. However its now come away completely and the chipboard has flaked away leaving 2 holes about 6mm in diameter. How would be best to fill these holes? They are the usual 35mm concealed hinges so I can't easily just mount the hinge lower on the door. Thanks in advance.