A guide tool adapted for removal of damage cartilage and bone and adapted for guiding insert tools during repair of diseased cartilage at an articulating surface of a joint is disclosed. The guide tool includes a guide base having a positioning body and a guide body protruding from the guide base. The guide body includes a height adjustment device and a guide channel with a length. The guide channel extends throughout the guide body and through the height adjustment device with one opening on a cartilage contact surface of the positioning body and one opening on the top of the height adjustment device. The guide body includes a height adjustment device being arranged to enable stepwise adjustment of the length.
